5. Drawing multiple graphs using the list function. Sharp EL-9900, el 9900c, EL9900

Chapter 9: List Features

7 stdDv( stdDv( list [, frequency list])

Returns the standard deviation of the specified list items.

Example

• Calculate the standard deviation using the list items of list L2.

8 varian( varian( list [, frequency list])

Returns the variance of the specified list items.

Example

• Calculate the variance using the list items of list L2.

Standard deviation and variance

Standard deviation: s =

Variance

Variance =

n

∑

k

= 1

(l

k

–

m)

2

n

–

1 where

n

= number of list items

l

k

= list item value

m

= mean value of the list

5. Drawing multiple graphs using the list function

Using list items as coordinates, you can simultaneously draw multiple graphs.

1. Press

Y.

2. Enter the equation;

Y1 = {3,

-

2}x 2

+

{5, 3}x

+

{2, 4}

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