![Sharp el-9950 Скачать руководство пользователя страница 143](http://html.mh-extra.com/html/sharp/el-9950/el-9950_manual_366141143.webp)
142
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.
Note: If relative frequencies or
probabilities are stored in the
frequency list, please use P_stdDv.
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.
9 P_stdDv( P_stdDv(
list [, frequency list]
)
Returns the population standard deviation of the specified list items.
Example
• Calculate the population
standard deviation using the
list items of list L2.
Standard deviation and variance
Standard deviation: s =
Variance =
Population standard deviation:
σ
=
where
n
= number of list items
l
k
= list item value
m
= mean value of the list
(Estimation)
(Estimation)
(Variance in case of complete survey)
Variance
n
–
1
(
l
k
–
m
)
2
Σ
k
= 1
n
n
(
l
k
–
m
)
2
Σ
k
= 1
n
Содержание el-9950
Страница 1: ......
Страница 11: ...10 Chapter 1 Getting Started To open the cover When in use When not in use Using the Hard Cover ...
Страница 266: ......