Engineers want to design seats in commercial aircraft they are wide enough to fit 90% of all males (accommodating 100% of males would require very wide seats that would be much more expensive) men have hip breadths that are normally distributed with a mean of 14.5 inches and a standard deviation of 1.2 inches. find P 90. That is find the hip breadth for men that separates the smallest 90% of the largest 10%