The total cholesterol levels of a sample of men aged?35-44are 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 of? blood?
?(b)If 256 men in the?35-44age group are randomly?selected,about how many would you expect to have a total cholesterol level greater than 251 milligrams per deciliter of ?blood?