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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

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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 mu= 170 milligrams of cholesterol per deciliter of blood (mg/dl) and standard deviation sigma = 30 mg/dl. Estimate the percent of boys whose cholesterol is below 140

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