Assuming cholestorol data indicated a mean total cholesterol level for adult persons 20 years of age and older in the United States was 190 mg/dl; with a known standard deviation of 30 mg/dl. Use a known standard deviation of 30 mg/dl and the underlying population is normally distributed. What is the probability that a randomly selected adult, ≥ 20 years of age will have a cholesterol level < 180 mg/dl?

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Assuming cholestorol data indicated a mean total cholesterol level for adult persons 20 years of age and older in the United States was 190 mg/dl; with a known standard deviation of 30 mg/dl. Use a known standard deviation of 30 mg/dl and the underlying population is normally distributed. What is the probability that a randomly selected adult, ≥ 20 years of age will have a cholesterol level < 180 mg/dl?

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