Below you will find brief information for fx-95MS, fx-100MS, fx-115MS, fx-912MS, fx-570MS, fx-991MS. The guide provides instructions for basic calculations, memory functions, scientific operations (trigonometry, logarithms, roots), equation solving, and statistical analysis. It covers topics like fraction operations, percentage calculations, angle unit conversions, and coordinate conversions. It also includes safety precautions, handling instructions and dealing with errors. It is designed to help users understand their calculator's functions.
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fx-95MS fx-100MS fx-115MS
(fx-912MS) fx-570MS fx-991MS
k fx-912MS owners
Please be sure to read the important notice of this manual.
E http://world.casio.com/edu_e/
CASIO ELECTRONICS CO., LTD.
Unit 6, 1000 North Circular Road,
London NW2 7JD, U.K.
• Before starting .....
1
Holding the cover as shown in the illustration, slide the unit out of the cover.
• After you are finished .....
2
Holding the cover as shown in the illustration, slide the unit out of the cover.
• Always slide the keyboard end of the unit into the cover first. Never slide the display end of the unit into the cover.
.....
1
.....
2
1
Be sure to read the following safety precautions before using this calculator. Keep this manual handy for later reference.
Caution
This symbol is used to indicate information that can result in personal injury or material damage if ignored.
Batteries
• After removing the battery from the calculator, put it in a safe place where it will not get into the hands of small children and accidentally swallowed.
• Keep batteries out of the reach of small children. If accidentally swallowed, consult with a physician immediately.
• Never charge batteries, try to take batteries apart, or allow batteries to become shorted. Never expose batteries to direct heat or dispose of them by incineration.
• Misuse of batteries can cause them to leak and damage nearby items, and can create the risk of fire and personal injury.
• Always make sure that the battery’s positive k and negative l ends are facing correctly when you load it into the calculator.
• Remove the battery if you do not plan to use the calculator for a long time (fx-95MS/100MS/570MS).
• Use only the type of battery specified for this calculator in this manual.
Disposing of the Calculator
• Never dispose of the calculator by burning it. Doing so can cause certain components to suddenly burst, creating the risk of fire and personal injury.
• The displays and illustrations (such as key markings) shown in this User’s Guide are for illustrative purposes
2
only, and may differ somewhat from the actual items they represent.
• The contents of this manual are subject to change without notice.
• In no event shall CASIO Computer Co., Ltd. be liable to anyone for special, collateral, incidental, or consequential damages in connection with or arising out of the purchase or use of these materials. Moreover, CASIO Computer
Co., Ltd. shall not be liable for any claim of any kind whatsoever against the use of these materials by any other party.
• Be sure to press the
5
key before using the calculator for the first time.
• Even if the calculator is operating normally, replace the battery at least once every three years for the fx-
115MS/fx-570MS/fx-991MS, or at least once every two years for the fx-95MS/fx-100MS.
A dead battery can leak, causing damage to and malfunction of the calculator. Never leave a dead battery in the calculator.
• The battery that comes with this unit discharges slightly during shipment and storage. Because of this, it may require replacement sooner than the normal expected battery life.
• Low battery power can cause memory contents to become corrupted or lost completely. Always keep written records of all important data.
• Avoid use and storage in areas subjected to temperature extremes.
Very low temperatures can cause slow display response, total failure of the display, and shortening of battery life.
Also avoid leaving the calculator in direct sunlight, near a window, near a heater or anywhere else it might be exposed to very high temperatures. Heat can cause discoloration or deformation of the calculator’s case, and damage to internal circuitry.
3
• Avoid use and storage in areas subjected to large amounts of humidity and dust.
Take care never to leave the calculator where it might be splashed by water or exposed to large amounts of humidity or dust. Such conditions can damage internal circuitry.
• Never drop the calculator or otherwise subject it to strong impact.
• Never twist or bend the calculator.
Avoid carrying the calculator in the pocket of your trousers or other tight-fitting clothing where it might be subjected to twisting or bending.
• Never try to take the calculator apart.
• Never press the keys of the calculator with a ballpoint pen or other pointed object.
• Use a soft, dry cloth to clean the exterior of the calculator.
If the calculator becomes very dirty, wipe it off with a cloth moistened in a weak solution of water and a mild neutral household detergent. Wring out all excess moisture before wiping the calculator. Never use thinner, benzene or other volatile agents to clean the calculator. Doing so can remove printed markings and can damage the case.
4
Removing and Replacing the
Calculator’s Cover ................................... 1
Safety Precautions .................................. 2
Handling Precautions ............................. 3
Two-line Display ...................................... 7
Before getting started... .......................... 7 k Modes .................................................................... 7 k Input Capacity ........................................................ 8 k Making Corrections During Input ........................... 9 k Replay Function ..................................................... 9 k Error Locator .......................................................... 9 k Multi-statements .................................................. 10 k Exponential Display Formats ............................... 10 k Decimal Point and Separator Symbols ................ 11 k Initializing the Calculator ...................................... 11
Basic Calculations ................................ 11 k Arithmetic Calculations ........................................ 11 k Fraction Operations ............................................. 12 k Percentage Calculations ...................................... 14 k Degrees, Minutes, Seconds Calculations ............ 15 k FIX, SCI, RND ..................................................... 15
Memory Calculations ............................ 16 k Answer Memory ................................................... 16 k Consecutive Calculations .................................... 17 k Independent Memory ........................................... 17 k Variables .............................................................. 17
Scientific Function Calculations .......... 18 k Trigonometric/Inverse Trigonometric Functions ... 18 k Hyperbolic/Inverse Hyperbolic Functions ............ 19
5
k Common and Natural Logarithms/
Antilogarithms ...................................................... 19 k Square Roots, Cube Roots, Roots, Squares, Cubes,
Reciprocals, Factorials, Random Numbers,
π
, and
Permutation/Combination .................................... 20 k Angle Unit Conversion ......................................... 21 k Coordinate Conversion (Pol ( x , y ), Rec ( r , )) ..... 21 k Engineering Notation Calculations ...................... 22
Equation Calculations .......................... 22 k Quadratic and Cubic Equations ........................... 22 k Simultaneous Equations ...................................... 24
Statistical Calculations ......................... 26
Standard Deviation .................................................. 26
Regression Calculations .......................................... 28
Technical Information ........................... 32 k When you have a problem...... ............................. 32 k Error Messages ................................................... 32 k Order of Operations ............................................. 34 k Stacks .................................................................. 35 k Input Ranges ....................................................... 36
Power Supply
(fx-95MS only)
...................... 38
Specifications (fx-95MS only) ..................... 39
6
• The upper line shows the calculation formula.
• The lower line shows the result.
A separator symbol is displayed every three digits when the integer part of the mantissa has more than three digits.
k Modes
Before starting a calculation, you must first enter the correct mode as indicated in the table below.
• The following table shows the modes and required operations for the fx-95MS only. Users of other models should refer to the “User’s Guide 2 (Additional
Functions)” for information about modes and their selection.
To perform this type of calculation:
Basic arithmetic calculations
Standard deviation
Regression calculations
Solution of equations
Perform this To enter key operation: this mode:
F 1
F 2
F 3
F F 1
COMP
SD
REG
EQN
7
• Pressing the F key more than twice displays additional setup screens. Setup screens are described in the sections of this manual where they are actually used to change the calculator setup.
• In this manual, the name of the mode you need to enter in order to perform the calculations being described is indicated in the main title of each section.
Equation
Calculations
EQN
• To return the calculation mode and setup to the initial defaults shown below, press A B 2 (Mode) = .
Calculation Mode:
Angle Unit:
COMP
Deg
Exponential Display Format: Norm 1
Fraction Display Format: a b / c
Decimal Point Character: Dot
• Mode indicators appear in the upper part of the display.
• Be sure to check the current calculation mode (SD, REG,
COMP) and angle unit setting (Deg, Rad, Gra) before beginning a calculation.
k Input Capacity
• The memory area used for calculation input can hold 79
“steps.” One step is taken up each time you press a number key or arithmetic operator key ( + , , , , \ ).
A A or p key operation does not take up a step, so inputting A D , for example, takes up only one step.
• You can input up to 79 steps for a single calculation.
Whenever you input the 73rd step of any calculation, the cursor changes from “_” to “ k ” to let you know memory is running low. If you need to input more than 79 steps, you should divide your calculation into two or more parts.
• Pressing the g key recalls the last result obtained, which you can use in a subsequent calculation. See “Answer
Memory” for more information about using the g key.
8
k Making Corrections During Input
• Use e and r to move the cursor to the location you want.
• Press [ to delete the number or function at the current cursor position.
• Press A K to change to an insert cursor t . Inputting something while the insert cursor is on the display inserts the input at the insert cursor position.
• Pressing A K , or = returns to the normal cursor from the insert cursor.
k Replay Function
• Every time you perform a calculation, the replay function stores the calculation formula and its result in replay memory. Pressing the [ key displays the formula and result of the calculation you last performed. Pressing [ again back steps sequentially (new-to-old) through past calculations.
• Pressing the e or r key while a replay memory calculation is on the display changes to the editing screen.
• Pressing the e or r key immediately after you finish a calculation displays the editing screen for that calculation.
• Pressing t does not clear replay memory, so you can recall the last calculation even after you press t .
• Replay memory capacity is 128 bytes for storage of both expressions and results.
• Replay memory is cleared by any of the following actions.
When you press the
5
key
When you initialize modes and settings by pressing A
B 2 (or 3 ) = .
When you change from one calculation mode to another
When you turn off the calculator.
k Error Locator
• Pressing r or e after an error occurs displays the calculation with the cursor positioned at the location where the error occurred.
9
k Multi-statements
A multi-statement is an expression that is made up of two or more smaller expressions, which are joined using a colon
( : ).
• Example: To add 2 + 3 and then multiply the result by 4
2 + 3 p \ g 4 =
2
+
3
5.
Disp
=
Ans
×
4
20.
k Exponential Display Formats
This calculator can display up to 10 digits. Larger values are automatically displayed using exponential notation. In the case of decimal values, you can select between two formats that determine at what point exponential notation is used.
• To change the exponential display format, press the F key a number of times until you reach the exponential display format setup screen shown below.
F i x Sc i No r m
1 2 3
• Press 3 . On the format selection screen that appears, press 1 to select Norm 1 or 2 for Norm 2.
u
With Norm 1, exponential notation is automatically used for integer values with more than 10 digits and decimal values with more than two decimal places.
u
With Norm 2, exponential notation is automatically used for integer values with more than 10 digits and decimal values with more than nine decimal places.
• All of the examples in this manual show calculation results using the Norm 1 format.
10
k Decimal Point and Separator Symbols
You can use the display setup (Disp) screen to specify the symbols you want for the decimal point and 3-digit separator.
• To change the decimal point and separator symbol setting, press the F key a number of times until you reach the setup screen shown below.
D i s p
1
• Display the selection screen.
fx-95MS:
Other Models:
1 r
1 r r
• Press the number key ( 1 or 2 ) that corresponds to the setting you want to use.
1 (Dot): Period decimal point, comma separator
2 (Comma): Comma decimal point, period separator k Initializing the Calculator
• Perform the following key operation when you want to initialize the calculation mode and setup, and clear replay memory and variables.
A B 3 (All) =
COMP k Arithmetic Calculations
Use the F key to enter the COMP Mode when you want to perform basic calculations.
COMP .............................................................
F 1
• Negative values inside of calculations must be enclosed within parentheses.
sin –1.23
→ S R D 1.23 T
11
• It is not necessary to enclose a negative exponent within parentheses.
sin 2.34 10 –5 → S 2.34 e D 5
• Example 1: 3 (5 10 –9 ) 1.5
10 –8
3 5 e D 9 =
• Example 2: 5 (9 7) 80 5 R 9 + 7 T =
• You can skip all
T
operations before = .
k Fraction Operations u
• Values are displayed in decimal format automatically whenever the total number of digits of a fractional value
(integer + numerator + denominator + separator marks) exceeds 10.
•
2
3
1
5
13
15
2 C 3 + 1 C 5 = 13 15.
00
• Example 2: 3
1
4
2
1
3
4
11
12
3 C 1 C 4 +
1 C 2 C 3 =
• Example 3:
2
4
1
2
•
1
Example 4:
2
1.6 2.1
4 11 12.
00
2 C 4 =
1 C 2 + 1.6 =
• Results of calculations that mix fraction and decimal values are always decimal.
u
↔
• Use the operation shown below to convert calculation results between decimal values and fraction values.
• Note that conversion can take as long as two seconds to perform.
12
• Example 1: 2.75 2
3
4
(Decimal → Fraction)
2.75 = 2.75
C
11
A B
4
•
1
2
↔
0.5 (Fraction
↔
Decimal)
2 3 4.
00
11 4.
00
1 C 2 = 1 2.
00
C 0.5
00
C 1 2.
00 u
↔
• Example:
2
1
3
↔
5
3
1 C 2 C 3 = 1 2 3.
00
A B
A B
5 3.
00
1 2 3.
00
• You can use the display setup (Disp) screen to specify the display format when a fraction calculation result is greater than one.
• To change the fraction display format, press the q key a number of times until you reach the setup screen shown below.
D i s p
1
• Display the selection screen.
fx-95MS:
Other Models:
1
1 r
• Press the number key ( 1 or 2 ) that corresponds to the setting you want to use.
1 (a b / c
): Mixed fraction
2 (d/c): Improper fraction
13
• An error occurs if you try to input a mixed fraction while the d/c display format is selected.
k Percentage Calculations
• Example 1 : To calculate 12% of 1500 (180)
1500 12 A v
• Example 2: To calculate what percentage of 880 is 660
(75%)
660 \ 880 A v
• Example 3 : To add 15% onto 2500 (2875)
2500 15 A v +
• Example 4 : To discount 3500 by 25% (2625)
3500 25 A v ,
• Example 5: To discount the sum of 168, 98, and 734 by
20% (800)
168 + 98 + 734 = g A j
1 p 1 20 A v ,
*
* As shown here, if you want to use the current Answer
Memory value in a mark up or discount calculation, you need to assign the Answer Memory value into a variable and then use the variable in the mark up/discount calculation. This is because the calculation performed when v is pressed stores a result to Answer Memory before the , key is pressed.
• Example 6: If 300 grams are added to a test sample originally weighing 500 grams, what is the percentage increase in weight?
(160%)
300 + 500 A v
• Example 7: What is the percentage change when a value is increased from 40 to 46? How about to 48?
(15%, 20%)
14
46 , 40 A v e e e e e e 8 =
k Degrees, Minutes, Seconds
Calculations
• You can perform sexagesimal calculations using degrees
(hours), minutes, and seconds, and convert between sexagesimal and decimal values.
• Example 1: To convert the decimal value 2.258 to a sexagesimal value and then back to a decimal value
2.258 =
A O
I
2.258
2
°
15
°
28.8
2.258
• Example 2: To perform the following calculation:
12
°
34’56” 3.45
12 I 34 I 56 I 3.45 = 43
°
24
°
31.2
k FIX, SCI, RND
• To change the settings for the number of decimal places, the number of significant digits, or the exponential display format, press the F key a number of times until you reach the setup screen shown below.
F i x Sc i No r m
1 2 3
• Press the number key ( 1 , 2 , or 3 ) that corresponds to the setup item you want to change.
1 (Fix): Number of decimal places
2 (Sci): Number of significant digits
3 (Norm): Exponential display format
• Example 1: 200 7 14
200 \ 7 14 =
400.
00
(Specifies three decimal places.) F
1 (Fix) 3
FIX
400.000
00
15
(Internal calculation continues using 12 digits.)
200 \ 7 =
14 =
28.571
00
400.000
00
The following performs the same calculation using the specified number of decimal places.
(Internal rounding)
200 \ 7 =
A Q
28.571
00
28.571
00
14 = 399.994
00
• Press F tion.
3 (Norm) 1 to clear the Fix specifica-
• Example 2: 1 3, displaying result with two significant digits (Sci 2)
F
2 (Sci) 2 1 \ 3 =
SCI
3.3
–01
• Press F tion.
3 (Norm) 1 to clear the Sci specifica-
COMP
Use the F key to enter the COMP Mode when you want to perform a calculation using memory.
COMP .............................................................
F 1 k Answer Memory
• Whenever you press = after inputting values or an expression, the calculated result automatically updates Answer Memory contents by storing the result.
• In addition to = , Answer Memory contents are also updated with result whenever you press A v , | , A
{ , or A j followed by a letter (A through F, or M, X, or Y).
16
• You can recall Answer Memory contents by pressing g .
• Answer Memory can store up to 12 digits for the mantissa and two digits for the exponent.
• Answer Memory contents are not updated if the operation performed by any of the above key operations results in an error.
k Consecutive Calculations
• You can use the calculation result that is currently on the display (and also stored in Answer Memory) as the first value of your next calculation. Note that pressing an operator key while a result is displayed causes the displayed value to change to Ans, indicating it is the value that is currently stored in Answer Memory.
• The result of a calculation can also be used with a subsequent Type A function (
^( x y ), x
, , , n P r and x n
2 ,
C r x
.
3 , x –1 , x !, DRG ' ), +, –, k Independent Memory
• Values can be input directly into memory, added to memory, or subtracted from memory. Independent memory is convenient for calculating cumulative totals.
• Independent memory uses the same memory area as variable M.
• To clear independent memory (M), input 0 A j
3
(M+).
• Example:
23 9 32
53 6 47
) 45 2 90
(Total) –11
23 + 9 A j 3
(M+)
53 , 6 |
45 2 A {
0 3
(M+) k Variables
• There are nine variables (A through F, M, X and Y), which can be used to store data, constants, results, and other values.
• Use the following operation to delete data assigned to a
17
particular variable: 0 A j 1
. This operation deletes the data assigned to variable A.
• Perform the following key operation when you want to clear the values assigned to all of the variables.
A B 1 (Mcl) =
• Example: 193.2 23 8.4
193.2 28 6.9
193.2 A j
1
\ 23 = p 1 \ 28 =
COMP
Use the F key to enter the COMP Mode when you want to perform basic arithmetic calculations.
COMP .............................................................
F 1
• Certain types of calculations may take a long time to complete.
•
• Wait for the result to appear on the display before starting the next calculation.
π
= 3.14159265359
k Trigonometric/Inverse Trigonometric
Functions
• To change the default angle unit (degrees, radians, grads), press the F key a number of times until you reach the angle unit setup screen shown below.
Deg Rad G r a
1 2 3
• Press the number key ( 1 , 2 , or 3 ) that corresponds to the angle unit you want to use.
(90
°
=
π
radians = 100 grads)
2
18
• Example 1: sin 63 ° 52 41 0.897859012
q
1 (
Deg)
S 63 I 52 I 41 I =
• Example 2: cos
(
rad
)
0.5
3 q
2 (
Rad)
W R A x \ 3
T =
• Example 3 : cos 1
2
0.25
π ( rad)
(
4
( rad)
)
2 q
2 ( Rad)
A V R L 2 \ 2
T = g \ A x =
• Example 4: tan 1 0.741
36.53844577 ° q
1
(
Deg)
A g 0.741 = k Hyperbolic/Inverse Hyperbolic
Functions
• Example 1: sinh 3.6 18.28545536
M S 3.6 =
• Example 2: sinh 1 30 4.094622224
M A j 30 = k Common and Natural Logarithms/
Antilogarithms
• Example 1: log 1.23 0.089905111
R 1.23 =
• Example 2: In 90 (= log e
90) = 4.49980967
ln e 1
T 90 =
T p P =
• Example 3: e 10 22026.46579
• Example 4: 10 1.5 31.6227766
• Example 5: 2 4 16
A
A
U
Q
2
10
1.5
=
=
W 4 =
19
k Square Roots, Cube Roots, Roots,
Squares, Cubes, Reciprocals,
Factorials, Random Numbers,
, and
Permutation/Combination
• Example 1: 2 3 5 5.287196909
L 2 + L 3 L 5 =
• Example 2:
3
5
3
27 –1.290024053
A D 5 + A D R D 27
T =
• Example 3:
7
1
123 ( = 123 ) 1.988647795
7 A H 123 =
• Example 4: 123 30 2 1023 123 + 30 K =
• Example 5: 12 3 1728 12
N
* =
* A N in the case of fx-570MS/fx-991MS.
• Example 6:
1
1
1
3 4
12
R
3 a , 4 a T a =
• Example 7: 8! 40320 8 A f =
• Example 8: To generate a random number between
0.000 and 0.999
A M = 0.664
00
(The above value is a sample only. Results differ each time.)
• Example 9: 3 π 9.424777961
3 A x =
• Example 10: To determine how many different 4-digit values can be produced using the numbers 1 through 7
• Numbers cannot be duplicated within the same 4-digit value (1234 is allowed, but 1123 is not).
(840)
7 A m 4 =
• Example 11: To determine how many different 4-member groups can be organized in a group of 10 individuals
(210)
10 n * 4 =
20
* A n in the case of fx-100MS/fx-115MS/fx-570MS/ fx-991MS.
k Angle Unit Conversion
• Press A v to display the following menu.
D R G
1 2 3
• Pressing 1 , 2 , or 3 converts the displayed value to the corresponding angle unit.
• Example: To convert 4.25 radians to degrees q
1 ( Deg)
4.25
4 . 2 5 r
A v 2 (R) =
243.5070629
k Coordinate Conversion (Pol ( x , y ),
Rec ( r ,
))
• Calculation results are automatically assigned to variables E and F.
• Example 1: To convert polar coordinates ( r 2, 60 ° ) to rectangular coordinates ( x , y ) (Deg) x 1 y 1.732050808
A F 2 P 60 T
0
= o
• Press
0 n to display the value of x , or
0 o to display the value of y .
• Example 2: To convert rectangular coordinates (1, 3) to polar coordinates ( r , ) (Rad) r 2 f * 1 P L 3 T =
* A f in the case of fx-100MS/fx-115MS/fx-570MS/ fx-991MS.
θ
1.047197551
0 o
• Press
0 n to display the value of r , or
0 o to display the value of .
21
k Engineering Notation Calculations
• Example 1: To convert 56,088 meters to kilometers
→ 56.088 10 3
(km)
56088 = J
• Example 2: To convert 0.08125 grams to milligrams
→ 81.25
10 –3
(mg)
0.08125 = J
EQN
The EQN Mode lets you solve equations up to three degrees and simultaneous linear equations with up to three unknowns.
Use the F key to enter the EQN Mode when you want to solve an equation.
EQN ..........................
F F 1 (fx-95MS)
F F F 1 (Other Models) k Quadratic and Cubic Equations
Quadratic Equation: ax 2 + bx + c = 0
Cubic Equation: ax 3 + bx 2 + cx + d = 0
Entering the EQN Mode and pressing r displays the initial quadratic/cubic equation screen.
Deg r ee?
2 3
Use this screen to specify 2 (quadratic) or 3 (cubic) as the degree of the equation, and input values for each of the coefficients.
Coefficient name a?
0.
Arrow indicates direction you should scroll to view other elements.
Element value
22
• Any time until you input a value for the final coefficient ( c for a quadratic equation, d for a cubic equation), you can use the [ and ] keys to move between coefficients on the screen and make changes, if you want.
• Note that you cannot input complex numbers for coefficients.
Calculation starts and one of the solutions appears as soon as you input a value for the final coefficient.
Variable name x 1=
0.
Arrow indicates direction you should scroll to view other solutions.
Solution
Press the ] key to view other solutions. Use [ and ] to scroll between all of the solutions for the equation.
Pressing the t key at this point returns to the coefficient input screen.
• Certain coefficients can cause calculation to take more time.
• Example 1: To solve the equation x 3 – 2 x 2 – x + 2 = 0 ( x = 2, –1, 1)
(Degree?) 3
( a ?)
( b ?)
( c ?)
( d ?)
( x 1 = 2)
( x 2 = –1)
1 =
D 2 =
D 1 =
2 =
]
]
( x 3 = 1)
• If a result is a complex number, the real part of the first solution appears first. This is indicated by the “R
↔ I ” symbol on the display. Press A r to toggle the display between the real part and imaginary part of a solution.
23
x 1=
D
0.25
R
⇔
I x 1=
D
A r
R ⇔ I
0.75
i
• Example 2: To solve the equation
8 x 2 – 4 x + 5 = 0 ( x = 0.25 ± 0.75
i )
(Degree?) 2
( a ?)
( b ?)
8 =
D 4 =
( c ?) 5 =
( x 1 = 0.25 + 0.75
i ) ]
( x 2 = 0.25 – 0.75
i ) k Simultaneous Equations
Simultaneous Linear Equations with Two Unknowns: a
1 x + b
1 y = c
1 a
2 x + b
2 y = c
2
Simultaneous Linear Equations with Three Unknowns: a
1 x + b
1 y + c
1 z = d
1 a
2 x + b
2 y + c
2 z = d
2 a
3 x + b
3 y + c
3 z = d
3
Entering the EQN Mode displays the initial simultaneous equation screen.
Unk now ns?
2 3
Use this screen to specify 2 or 3 as the number of unknowns, and input values for each of the coefficients.
Coefficient name a 1?
0.
Arrow indicates direction you should scroll to view other elements.
Element value
24
• Any time until you input a value for the final coefficient
( c
2
for two unknowns, d
3
for three unknowns), you can use the [ and ] keys to move between coefficients on the screen and make changes, if you want.
• Note that you cannot input complex numbers for coefficients.
Calculation starts and one of the solutions appears as soon as you input a value for the final coefficient.
Variable name x=
Arrow indicates direction you should scroll to view other solutions.
0.
Solution
Press the ] key to view other solutions. Use [ and ] to scroll between all of the solutions for the equation.
Pressing the t key at this point returns to the coefficient input screen.
• Example: To solve the following simultaneous equations
2 x + 3 y – z = 15
3 x – 2 y + 2 z = 4
5 x + 3 y – 4 z = 9 ( x = 2, y = 5, z = 4)
(Unknowns?)
( a
1
?) ....... ( d
1
?)
( a
2
?) ....... ( d
2
?)
( a
3
?) ....... ( d
3
?)
( x = 2)
( y = 5)
( z = 4)
3
2 = 3 = D 1 = 15 =
3 = D 2 = 2 = 4 =
5 = 3 = D 4 = 9 =
]
]
25
Standard Deviation
SD
REG
SD
Use the F key to enter the SD Mode when you want to perform statistical calculations using standard deviation.
SD ....................................
F 2 (fx-95MS)
F F 1 (Other Models)
• Always start data input with A B 1 (Scl) = to clear statistical memory.
• Input data using the key sequence shown below.
< x -data> S
• Input data is used to calculate values for n ,
Σ x ,
Σ x 2 , o ,
σ n and
σ n 1
, which you can recall using the key operations noted nearby.
To recall this type of value:
Σ x 2
Σ x n o
σ n
σ n 1
Perform this key operation:
A U 1
A U 2
A U 3
A X 1
A X 2
A X 3
• Example: To calculate
σ n 1
,
σ n , o , n ,
Σ x , and
Σ x 2 for the following data : 55, 54, 51, 55, 53, 53, 54, 52
In the SD Mode:
A B 1 (Scl) = (Stat clear)
55 S n =
SD
1.
Each time you press S to register your input, the number of data input up to that point is indicated on the display ( n value).
54 S 51 S 55 S
53 S S 54 S 52 S
Sample Standard Deviation (
σ n 1 ) = 1.407885953
A X 3 =
26
Population Standard Deviation (
σ n ) = 1.316956719
Arithmetic Mean ( o ) = 53.375
Number of Data ( n ) = 8
Sum of Values (
Σ x ) = 427
Sum of Squares of Values (
Σ x 2 ) = 22805
A X 2 =
A X 1 =
A U 3 =
A U 2 =
A U 1 =
• S S inputs the same data twice.
• You can also input multiple entries of the same data using A G . To input the data 110 ten times, for example, press 110 A G 10 S .
• You can perform the above key operations in any order, and not necessarily that shown above.
• While inputting data or after inputting data is complete, you can use the [ and ] keys to scroll through data you have input. If you input multiple entries of the same data using A G to specify the data frequency (number of data items) as described above, scrolling through data shows both the data item and a separate screen for the data frequency (Freq).
• You can then edit the displayed data, if you want. Input the new value and then press the = key to replace the old value with the new one. This also means that if you want to perform some other operation (calculation, recall of statistical calculation results, etc.), you should always press the t key first to exit data display.
• Pressing the S key instead of = after changing a value on the display registers the value you input as a new data item, and leaves the old value as it is.
• You can delete a data value displayed using [ and ] by pressing A U . Deleting a data value causes all values following it to be shifted up.
• Data values you register are normally stored in calculator memory. The message “Data Full” appears and you will not be able to input any more data if there is no memory left for data storage. If this happens, press the
= key to display the screen shown below.
Ed i t OFF ESC
1 2
27
Press 2 to exit data input without registering the value you just input.
Press 1 if you want to register the value you just input, without saving it in memory. If you do this, however, you will not be able to display or edit any of the data you have input.
• To delete data you have just input, press A U .
• After inputting statistical data in the SD Mode or REG
Mode, you will be unable to display or edit individual data items any longer after perform either the following operations.
Changing to another mode
Changing the regression type (Lin, Log, Exp, Pwr, Inv,
Quad)
Regression Calculations
REG
Use the F key to enter the REG Mode when you want to perform statistical calculations using regression.
REG .................................
F 3 (fx-95MS)
F F 2 (Other Models)
• Entering the REG Mode displays screens like the ones shown below.
L i n Log Ex p
1 2 3 r e
Pw r I nv Quad
1 2 3
• Press the number key ( 1 , 2 , or 3 ) that corresponds to the type of regression you want to use.
1 (Lin) : Linear regression
2 (Log) : Logarithmic regression
3 (Exp) : Exponential regression r 1 (Pwr) : Power regression r 2 (Inv) : Inverse regression r 3 (Quad) : Quadratic regression
28
• Always start data input with A B 1 (Scl) = to clear statistical memory.
• Input data using the key sequence shown below.
< x -data> P < y -data> S
• The values produced by a regression calculation depend on the values input, and results can be recalled using the key operations shown in the table below.
To recall this type of value: Perform this key operation:
Σ x 2
Σ x n
Σ y 2
Σ y
Σ xy o x
σ x
σ n n -1 p y
σ n y
σ n -1
Regression coefficient A
Regression coefficient B
A U 1
A U 2
A U 3
A U r 1
A U r 2
A U r 3
A X 1
A X 2
A X 3
A X r 1
A X r 2
A X r 3
A X r r 1
A X r r 2
Regression calculation other than quadratic regression
Correlation coefficient r A X r r 3 m n
A
A
X
X r r r r r r
1
2
• The following table shows the key operations you should use to recall results in the case of quadratic regression.
To recall this type of value:
Σ x 3
Σ x 2 y
Σ x 4
Regression coefficient C m
1 m
2 n
Perform this key operation:
A U r r 1
A U r r 2
A U r r 3
A X r r 3
A X r r r 1
A X r r r 2
A X r r r 3
29
• The values in the above tables can be used inside of expressions the same way you use variables.
u
• The regression formula for linear regression is: y = A + B x .
• Example: Atmospheric Pressure vs. Temperature
Temperature
10 ° C
15
°
C
20
°
C
25 ° C
30 ° C
Atmospheric
Pressure
1003 hPa
1005 hPa
1010 hPa
1011 hPa
1014 hPa
Perform linear regression to determine the regression formula terms and correlation coefficient for the data nearby. Next, use the regression formula to estimate atmospheric pressure at 18 ° C and temperature at 1000 hPa. Finally, calculate the coefficient of determination ( r 2 ) and sample covariance .
In the REG Mode:
1 (Lin)
A B 1 (Scl) = (Stat clear)
10 P 1003 S n=
REG
1.
Regression Coefficient A = 997.4
Regression Coefficient B = 0.56
Each time you press S to register your input, the number of data input up to that point is indicated on the display ( n value).
15 P 1005 S
20 P 1010 S 25 P 1011 S
30 P 1014 S
A X r r 1 =
A X r r 2 =
Correlation Coefficient r = 0.982607368
A X r r 3 =
Atmospheric Pressure at 18
°
C = 1007.48
18 A X r r r 2 =
30
Temperature at 1000 hPa = 4.642857143
1000 A X r r r 1 =
Coefficient of Determination = 0.965517241
A X r r 3 K =
Sample Covariance = 35
E A U r 3 ,
A U 3 A X 1 -
A X r 1 F \
E A U 3 , 1 F = u
• Use the same key operations as linear regression to recall results for these types of regression.
• The following shows the regression formulas for each type of regression.
Logarithmic Regression y A B ⴢ
In x
Exponential Regression y A ⴢ e B
· x
(In y In A + B x )
Power Regression
Inverse Regression y A ⴢ x B (In y A B ⴢ 1 / x y In A + B In x ) u
• The regression formula for quadratic regression is: y = A + B x + C x 2 .
• Example: x i
29
50
74
103
118 y i
1.6
23.5
38.0
46.4
48.0
Perform quadratic regression to determine the regression formula terms for the data nearby. Next, use the regression formula to estimate the values for n (estimated value of y ) for x i
= 16 and m (estimated value of x ) for y i = 20.
In the REG Mode: r 3 (Quad)
A B 1 (Scl) = (Stat clear)
29 P 1.6 S 50 P 23.5 S
74 P 38.0 S 103 P 46.4 S
118 P 48.0 S
31
Regression Coefficient A = –35.59856934
Regression Coefficient B = 1.495939413
A X r r 1 =
A X r r 2 =
Regression Coefficient C = – 6.71629667 10 –3
A X r r 3 = n when x i is 16 = –13.38291067
16 A X r r r 3 = m
1 when y i is 20 = 47.14556728
m
2
when y i is 20 = 175.5872105
20 A X r r r 1 =
20 A X r r r 2 =
• S S inputs the same data twice.
• You can also input multiple entries of the same data using A G . To input the data “20 and 30” five times, for example, press 20 P 30 A G 5 S .
• The above results can be obtained in any order, and not necessarily that shown above.
• Precautions when editing data input for standard deviation also apply for regression calculations.
k When you have a problem......
If calculation results are not what you expect or if an error occurs, perform the following steps.
1. Press A B 2 (Mode) = to initialize all modes and settings.
2. Check the formula you are working with to confirm it is correct.
3. Enter the correct mode and try performing the calculation again.
If the above steps do not correct the problem, press the
5
key. The calculator performs a self-check operation and deletes all data stored in memory if any abnormality is detected. Make sure you always keep written copies of all important data.
k Error Messages
The calculator is locked up while an error message is on
32
the display. Press t to clear the error, or press e or r to display the calculation and correct the problem. See
“Error Locator” for details.
• Causes
• Calculation result is outside the allowable calculation range.
• An attempt to perform a function calculation using a value that exceeds the allowable input range.
• An attempt to perform an illogical operation (division by zero, etc.)
• Action
• Check your input values and make sure they are all within the allowable ranges. Pay special attention to values in any memory areas you are using.
• Cause
• The capacity of the numeric stack or operator stack is exceeded.
• Action
• Simplify the calculation. The numeric stack has 10 levels and the operator stack has 24 levels.
• Divide your calculation into two or more separate parts.
• Cause
• An attempt to perform an illegal mathematical operation.
• Action
• Press e or r to display the calculation with the cursor located at the location of the error and make required corrections.
• Cause
• Improper use of an argument
33
• Action
• Press e or r to display the location of the cause of the error and make required corrections.
k Order of Operations
Calculations are performed in the following order of precedence.
1 Coordinate transformation: Pol ( x , y ), Rec ( r ,
θ
)
Differentials:
Integrations: d/dx *
∫ dx *
Normal distribution: P(*, Q(*, R(*
2 Type A functions:
With these functions, the value is entered and then the function key is pressed.
x 3 , x 2 , x 1 , x !, ° ’ ”
Engineering symbols*
Normal distribution:
→ m
, m
1
, m
2
, n t *
Angle unit conversions (DRG ' )
3 Powers and roots:
4
Metric conversions** a b
/ c
^ ( x y
) , x
5 Abbreviated multiplication format in front of
π
, e (natural logarithm base), memory name, or variable name:
2
π
, 3 e , 5A,
π
A, etc.
6 Type B functions:
With these functions, the function key is pressed and then the value is entered.
tan
,
3
, log, In, e x
, 10 x
, sin, cos, tan, sin
1 , sinh, cosh, tanh, sinh 1 , cosh
1
, cos
1 , tanh 1
1
, ( )
, d*, h*, b*, o*, Neg*, Not*, Det**, Trn**, arg*, Abs*, Conjg*
7 Abbreviated multiplication format in front of Type B functions: 2 3, Alog2, etc.
8 Permutation and combination:
∠ * n P r , n C r
9 Dot (
•
)**
0 ,
!
,
@ and*
# xnor*, xor*, or*
34
* fx-100MS/fx-115MS/fx-570MS/fx-991MS only.
** fx-570MS/fx-991MS only.
• Operations of the same precedence are performed from right to left. e x
In 120 → e x
{In( 120)}
• Other operations are performed from left to right.
• Operations enclosed in parentheses are performed first.
• When a calculation contains an argument that is a negative number, the negative number must be enclosed within parentheses. The negative sign (–) is treated as a Type B function, so par ticular care is required when the calculation includes a high-priority
Type A function, or power or root operations.
Example: ( –2) 4 = 16 k Stacks
–2 4 = –16
This calculator uses memory areas, called “stacks,” to temporarily store values (numeric stack) and commands (command stack) according to their precedence during calculations. The numeric stack has 10 levels and the command stack has 24 levels. A stack error (Stack ERROR) occurs whenever you try to perform a calculation that is so complex that the capacity of a stack is exceeded.
• Matrix calculations use up to two levels of the matrix stack.
Squaring a matrix, cubing a matrix, or inverting a matrix uses one stack level. (fx-570MS, fx-991MS only)
• Example:
1
1 2 3
2
4
3
5 6
4
7
5
Numeric Stack
1
2
2
3
3
4
4
5
5
4
Command Stack
1
2
3
4
5
6
7
35
• Calculations are performed in sequence according to
“Order of Operations.” Commands and values are deleted from the stack as the calculation is performed.
k Input Ranges
Internal digits: 12
Accuracy * : As a rule, accuracy is
±
1 at the 10th digit.
Functions Input Range sin x DEG 0 x 4.499999999
10 10
RAD 0 x 785398163.3
GRA 0 x 4.999999999
10 10 cos x DEG 0 x 4.500000008
10 10
RAD 0 x 785398164.9
GRA 0 x 5.000000009
10 10 tan x DEG Same as sin x , except when x = (2 n -1) 90.
RAD Same as sin x , except when x = (2 n -1) π /2.
GRA Same as sin x , except when x = (2 n -1) 100.
sin –1 x cos –1 x
0 x 1 tan –1 x 0 x 9.999999999
10 99 sinh x cosh x
0 x 230.2585092
sinh –1 x 0 x 4.999999999
10 99 cosh –1 x 1 x 4.999999999
10 99 tanh x 0 x 9.999999999
10 99 tanh –1 x 0 x 9.999999999
10 –1 log x / ln x 0 x 9.999999999
10 99
10 x
–9.999999999
10 99 x 99.99999999
e x
–9.999999999
10 99 x 230.2585092
36
Functions
Pol( x , y )
Input Range x 2 x 0 x 1 10 100 x 1 10 50
3
1/ x x 1 10 100 ; x G 0 x x 1 10 100 x !
0 x 69 ( x is an integer) n P r
0 n 1 10 10 , 0 r n ( n , r are integers)
1 { n !/( n – r )!} 1 10 100 n C r
0 n 1 10 10 , 0 r n ( n , r are integers)
1 [ n !/{ r !( n – r )!}] 1 10 100 x , y 9.999999999
10 49
( x 2 + y 2 ) 9.999999999
10 99
Rec( r , ) 0 r 9.999999999
θ
: Same as sin x
10 99
° ’ ” a , b , c 1 10 100
0 b , c x 1 10 100
Decimal ↔ Sexagesimal Conversions
0
°
0
°
0
° x 999999
°
59
°
^( x y ) x 0: –1 10 100 y log x 100 x 0: y 0
1 x 0: y n , ( n is an integer)
2 n +1
However: –1 10 100 y log x 100 x a b / y 0: x G 0
–1 10 100 1/ x log y 100 y y 0: x 0
1 y 0: x 2 n 1, ( n G 0; n is an integer) n
However: –1 10 100 1/ x log y 100 c
Total of integer, numerator, and denominator must be 10 digits or less (including division marks).
SD
(REG) x 1 10 50 y 1 10 50 n 1 10 100 x n , y n , o , p : n G 0 x n – 1
, y n – 1
, A, B, r : n G 0, 1
37
* For a single calculation, calculation error is ± 1 at the
10th digit. (In the case of exponential display, calculation error is ± 1 at the last significant digit.) Errors are cumulative in the case of consecutive calculations, which can also cause them to become large. (This is also true of internal consecutive calculations that are performed in the case of ^( x y
), x y , x !,
3
, n P r , n C r , etc.)
In the vicinity of a function’s singular point and point of inflection, errors are cumulative and may become large.
(fx-95MS only)
Users of other models should refer to the “User’s Guide 2
(Additional Functions).”
This calculator is powered by a single AA-size battery.
Dim figures on the display of the calculator indicate that battery power is low. Continued use of the calculator when the battery is low can result in improper operation. Replace the battery as soon as possible when display figures become dim.
1 Press A i to turn power off.
2 Remove the six screws that hold the back cover in place and then remove the back cover.
3 Remove the old battery.
4 Load a new battery into the unit with its positive negative k and l ends facing correctly.
5 Replace the back cover and secure it in place with the six screws.
6 Press
5
to turn power on.
Screw
38
Screw
u
Calculator power automatically turns off if you do not perform any operation for about six minutes. When this happens, press
5
to turn power back on.
(fx-95MS only)
Users of other models should refer to the “User’s Guide 2
(Additional Functions).”
Power Supply: Single AA-size battery (R6P (SUM-3))
Battery Life: Approximately 17,000 hours continuous display of flashing cursor.
Approximately 2 years when left with power turned off.
Dimensions: 19.5 (H) 78 (W) 155 (D) mm
3 /
4
(H) 3 1 /
16
(W) 6 1 /
8
(D)
Weight: 130 g (4.6 oz) including battery
Power Consumption: 0.0002 W
Operating Temperature: 0
°
C to 40
°
C (32
°
F to 104
°
F)
The names fx-912MS (Japan domestic model name) and fx-115MS (international model name) apply to the same model. Owners of the fx-912MS should refer to the description of fx-115MS.
39
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Two-line display for formula and result viewing
Comprehensive scientific function calculations
Equation solving capabilities (quadratic, cubic, simultaneous)
Statistical calculations, including standard deviation and regression
Memory functions for storing and recalling values
Fraction and percentage calculations
Angle unit conversions and coordinate conversions
Always start data input with A B 1 (Scl) = to clear statistical memory.
Press AO after inputting the decimal value to convert it to degrees, minutes, and seconds.
Perform the following key operation when you want to clear the values assigned to all of the variables: A B 1(Mcl) =
Press t to clear the error, or press e or r to display the calculation and correct the problem. See “Error Locator” for details.
What types of operations can the calculator perform?
The calculator can perform calculations including: Basic arithmetic, fractions, percentages, memory calculations, scientific functions (trigonometric, logarithmic, roots, factorials, random numbers), equations (quadratic and cubic, simultaneous), and statistical calculations (standard deviation, regression).
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