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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 =
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}