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Engineers want to design seats in commercial aircraft so that they are wide enough to fit 90% of all males. (Accommodating 100% of males would
Engineers want to design seats in commercial aircraft so that they are wide enough to fit
90%
of all males. (Accommodating 100% of males would require very wide seats that would be much too expensive.) Men have hip breadths that are normally distributed with a mean of
14.3
in. and a standard deviation of
1.2
in. Find
P90.
That is, find the hip breadth for men that separates the smallest
90%
from the largest
10%
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