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​...

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 14.5 in. and a standard deviation of 0.9 in. Find Upper P 90.

That​ is, find the hip breadth for men that separates the smallest 90​% from the largest 10​%.