Texas Instruments TI-84 User Manual
Page 337
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
Л
95
¢
165
Л
1
¢
6
Л
35
¤ Н.
.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