Sharp EL9900C EL-9900C - Page 151
Drawing multiple graphs using the list function
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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 Variance = n ∑ (lk - m)2 k = 1 n - 1 where n = number of list items lk = 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}x2 + {5, 3}x + {2, 4} 141
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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}