The total cholesterol levels of a sample of men aged35-44are
The total cholesterol levels of a sample of men aged35-44are normally
distributed with a mean of
220
milligrams per deciliter and a standard deviation of
37.4
milligrams per deciliter.
(a)What percent of the men have a total cholesterol level less than
235
milligrams per deciliter ofblood?
(b)If
256
men in the35-44age group are randomlyselected,about how many would you expect to have a total cholesterol level greater than
251
milligrams per deciliter ofblood?