For Exercise 1.70, see page 40; for 1.71 to 1.73, see pages 41-42; for 1.74 to 1.77, see pages 44-45; for 1.78, see page 46; for 1.79 and 1.80, see page 49; for 1.81 and 1.82, see page 50; and for 1.83 and 1.84, see page 53.

Question 1.75

1.75 More on young men’s heights.

The distribution of heights of young men is approximately Normal with mean 69 inches and standard deviation 2.5 inches. Use the 68-95-99.7 rule to answer the following questions.

  1. What percent of these men are taller than 74 inches?
  2. Between what heights do the middle 95% of young men fall?
  3. What percent of young men are shorter than 66.5 inches?

1.75

(a) 2.5%. (b) Between 64 and 74 inches. (c) 16%.