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16–16 Statistics Programs
File name 33s-English-Manual-040130-Publication(Edition 2).doc Page : 388
Printed Date : 2004/1/30 Size : 13.7 x 21.2 cm
t
D
value
Starts the distribution program and
prompts for
X.
3
¥
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.
10000
¸
Multiplies by the population.
Displays the approximate number of
blind dates in the local population
that meet the criteria.
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
¥
.
Keys:
(In RPN mode)
Display: Description:
¥
Resumes program.
2
¥
Enters X–value of 2 and calculates
Q(X).
10000
¸
Multiplies by the population for the
revised estimate.
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
?
Keys:
(In RPN mode)
Display: Description:
t
S
Starts the initialization routine.