13.21 More on men’s heights. The distribution of heights of young men is approximately Normal with mean 70 inches and standard deviation 2.5 inches. Use the 68–95–99.7 rule to answer the following questions.
(a) What percentage of men are taller than 77.5 inches?
(b) Between what heights do the middle 68% of men fall?
(c) What percentage of men are shorter than 65 inches?