HP -32S Owner's Manual page 222

10000 0 13.5049 Multiplies by the
population. Displays
the approximate num
ber of blind dates in
the local population,
which meet the
criteria.
Since your friend has been known to exaggerate from time to time,
you decide to see how rare a "2a" date might be. Note that the pro
gram may be rerun simply by pressing IR/s I.
Keys:
Display:
Description:
IR/SI
X?3.0000
Resumes program.
2|R/S|
Q=0.0227
Enters X-value of 2
and calculates Q(X).
10000 0
227.4937
Multiplies by the
population for the re
vised estimate.
Example 2. The mean of a set of test scores is 55. The standard devi
ation is 15.3. Assuming that the standard normal curve adequately
models the distribution, what is the probability that a randomly se
lected student scored 90? What is the score that only 10 percent of the
students would be expected to have surpassed? What would be the
score that only 20 percent of the students would have failed to
achieve?
220 13: Statistics Programs