Sharp EL-9900 - Drawing Multiple Graphs Using the List Function

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}