4. The blood cholesterol levels of men age 55 to 64 are approximately Normal, with mean 222 milligrams per deciliter (mg/dL) and standard deviation 37 mg/dl. (a) What percent of these men have high...

4. The blood cholesterol levels of men age 55 to 64 are approximately Normal, with mean 222 milligrams per deciliter (mg/dL) and standard deviation 37 mg/dl.

(a) What percent of these men have high cholesterol (levels above 240 mg/dl)?

(b) What percent have elevated cholesterol (between 200 and 240 mg/dl)?

(c) In order to belong to the 20% group with the highest cholesterol level, what is the minimum cholesterol level a person must have in order to belong to this group?