Do you have enough good cholesterol? Highdensity
Chapter , Problem 1.144(choose chapter or problem)
Do you have enough good cholesterol? Highdensity lipoprotein (HDL) is sometimes called the good cholesterol because low values are associated with a higher risk of heart disease. According to the American Heart Association, people over the age of 20 years should have at least 40 milligrams per deciliter (mg/dl) of HDL cholesterol.40 U.S. women aged 20 and over have a mean HDL of 55 mg/dl with a standard deviation of 15.5 mg/dl. Assume that the distribution is Normal. (a) What percent of women have low values of HDL (40 mg/dl or less)? (b) HDL levels of 60 mg/dl and higher are believed to protect people from heart disease. What percent of women have protective levels of HDL? (c) Women with more than 40 mg/dl but less than 60 mg/dl of HDL are in the intermediate range, neither very good or very bad. What proportion are in this category?
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