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Statistics and Probability Random Variables and Probahllitv Distributions 2. High levels of cholesterol in the blood increase the risk of heart disease. For 14-year-old boys. the distribution of blood cholesterol is approximately normal with mean .u. = I?!) milligrams of cholesterol per deciliter of blood {mgfdll and standard deviation or = 3|] mgfdl. a. What percent of 14-year-old boys have less than 150 mdfdl of cholesterol? h. Cholesterol levels above 240 mgfdl may require medical attention. What percent of 14-year-old boys have more than 2-1-0 maid] of cholesterol? c. People with cholesterol levels between zoo and 240 tog/til are at considerable risk for heart disease. Mist percent of 14-year-old boys have blood cholesterol between 200 and 240 11:31:11