Texas Instruments -84 Plus, Manual Book

Page: 337 / 696

Chapter 13: Inferential Statistics and Distributions 334
If the height distribution among a population of women is normally distributed with a
mean
m
of 165.1 centimeters and a standard deviation
s
of 6.35 centimeters, what height
is exceeded by only 5 percent of the women (the 95th percentile)?
The result is displayed on the home screen; it shows that five percent of the women are
taller than 175.5 centimeters.
Now graph and shade the top 5 percent of the population.
10. Press
‘
to clear the home screen.
Press
y =
to display the
DISTR
(distributions) menu.
11. Press
3
to paste
invNorm(
to the home screen.
Press
Ë
95
¢
165
Ë
1
¢
6
Ë
35
¤ Í
.
.95 is the area, 165.1 is
m
, and 6.35 is
s
.
12. Press
p
and set the window variables to
these values.
Xmin=145 Ymin=
L
.02 Xres=1
Xmax=185 Ymax=.08
Xscl=5 Yscl=0