1. The total cholesterol levels of a sample of men aged? 35-44 are normally distributed with a mean of 219 milligrams per deciliter and a standard deviation of 37.8 milligrams per deciliter.
(a) What percent of the men have a total cholesterol level less than 235 milligrams per deciliter of? blood?
(b) If 260 men in the? 35-44 age group are randomly? selected, about how many would you expect to have a total cholesterol level greater than 256 milligrams per deciliter of? blood?
2. Use the normal distribution of fish lengths for which the mean is 11 inches and the standard deviation is 2 inches. Assume the variable x is normally distributed.
(a) What percent of the fish are longer than 12 ?inches?
(b) If 400 fish are randomly? selected, about how many would you expect to be shorter than 8 ?inches?