1. The heights of 13,000 males are normally distributed with a mean of 70 inches and a standard deviation of 21 inches. Determine:

a) the percent of males with heights above 75 inches.

b) the percent of males with heights between 66 and 79 inches.

c) the height such that exactly 55% of male students from the sample do not exceed that height.

2. In a random sample of 195 weights of newborn boys, it was found that x =32.7hg. a) Construct a 95% CI estimate of the mean weight of newborn boys. In a previous study, was known to be 6.6 hg.

b) If a newborn boy has a weight of 30.5 hg., how does his weight compare with other newborn boys? Explain very clearly your answer.