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)( >= −
−
σσπ
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.