Calculator User Manual

TI-83 Plus Inferential Statistics and Distributions 425
normalpdf(
normalpdf(
computes the probability density function (
pdf
) for the normal
distribution at a specified
x
value. The defaults are mean
m
=0 and
standard deviation
s
=1. To plot the normal distribution, paste
normalpdf(
to the
Y=
editor. The probability density function (pdf) is:
0,
2
1
)(
2
2
2
)(
>=
−
−
σ
σπ
σ
µ
x
exf
normalpdf(
x
[
,
m
,
s
]
)
Note: For this example,
Xmin = 28
Xmax = 42
Ymin = 0
Ymax = .25
Tip: For plotting the normal distribution, you can set window variables
Xmin
and
Xmax
so that the mean
m
falls between them, and then select
0:ZoomFit
from the
ZOOM
menu.