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Chapter 8: Statistics & Regression Calculations
7. Distribution functions
The calculator has distribution features to find statistical calculations.
To enter the distribution menu,
1. Press
S
F
(F DISTRI).
The distribution menu will appear.
2. There are 15 options in the
distribution menu. Press
'
to navigate between
pages, and press
{
or
}
to scroll the window.
3. Press
E
to select the function.
4. Input the specified values.
5. Press
E
to solve.
Note: All functions of the distribution feature can be displayed as a graph
by using the graphing feature.
01 pdfnorm( pdfnorm(
value [, mean, standard deviation]
)
Finds the probability density of the specified value x for the normal
distribution N(
µ
,
s
2
). A list cannot be used.
* When mean (
µ
) and standard deviation (
s
) are omitted,
µ
= 0 and
s
= 1 are applied.
Example
Find the nominal distribution
probability density for x = 65
when the normal distribution of
the test score averages is 60
with a standard deviation of 6.
02 cdfnorm( cdfnorm(
lower limit, upper limit [, mean, standard deviation]
)
Calculates the normal distribution probability of a specified range x
for the normal distribution N(
µ
,
s
2
). A list cannot be used.
* When mean (
µ
) and standard
deviation (
s
) are omitted,
µ
= 0
and
s
= 1 are applied.
Example
Calculate the probability of range
x = 54 to 66 in the above sample.
