Sharp EL-9450, Operation Manual

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116
Chapter 7: 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 =
where
n
= number of list items
l
k
= list item value
m
= mean value of the list
Variance
n
–
1
(
l
k
–
m
)
2
∑
k = 1
n
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}