Question-1) The serum cholesterol levels of a certain population of boys have a mean of 170 mg/dl and a standard deviation of 30 mg/dl. (a) Find the probability that a randomly chosen boy has a serum cholesterol level of 155 mg/dl or less. (b) Find the probability that the mean serum cholesterol level of a random sample of 100 boys is below 164 mg/dl. (c) Find the 87th percentile for the mean serum cholesterol level of a random sample of 100 boys

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