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Determine the probability. The serum cholesterol levels of a certain population of boys with a mean of 170 mg/dl and a standard deviation of 30

Determine the probability.

The serum cholesterol levels of a certain population of boys with a mean of 170 mg/dl and a standard deviation of 30 mg/dl. Determine the probability that the mean serum cholesterol level of a random sample of 100 boys is below 164 mg/dl.

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