Too much cholesterol in the blood increases the risk of heart disease. The cholesterol levels of young women aged 20 to 34 years vary approximately Normally, with a mean of 185 milligrams per...

Too much cholesterol in the blood increases the risk of heart disease. The cholesterol levels of young women aged 20 to 34 years vary approximately Normally, with a mean of 185 milligrams per deciliter (mg/dl) and a standard deviation of 39 mg/dl. Cholesterol levels for middle‑aged men vary Normally, with a mean of 222 mg/dl and a standard deviation of 37 mg/dl. Sandy is a young woman with a cholesterol level of 220. Her father has a cholesterol level of 250.