Sharp el-9900c Mode D’Emploi
141
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}