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The cholesterol levels of 14-year-old boys are Normally distributed with mean 17 mg/dL and standard...

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The cholesterol levels of 14-year-old boys are Normally distributed with mean 17 mg/dL and standard deviation 30 mg/dL.Suppose you pick a 14-year-old boy at random and measure his cholesterol.What is the probability that his cholesterol is less than 140?

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