HP 35s Scientific Calculator User Manual
Page 263
16-17
Since your friend has been known to exaggerate from time to time, you decide to
see how rare a "2
σ" date might be. Note that the program may be rerun simply by
pressing
.
Example 2:
The mean of a set of test scores is 55. The standard deviation is 15.3. Assuming that
the standard normal curve adequately models the distribution, what is the
probability that a randomly selected student scored at least 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?
Accepts the default value of zero for M.
Accepts the default value of 1 for S.
D
value
Starts the distribution program and
prompts for X.
Enters 3 for X and starts computation of
Q(X). Displays the ratio of the
population smarter than everyone
within three standard deviations of the
mean.
Multiplies by the population. Displays
the approximate number of blind dates
in the local population that meet the
criteria.
Keys:
(In RPN mode)
Display:
Description:
Resumes program.
Enters X–value of 2 and calculates
Q(X).
Multiplies by the population for the
revised estimate.