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A DVD rental store wants to know what proportions of its customers are under age 21. A simple random sample of 500 customers was taken, and 375 of them were under age 21. Presume that the true population proportion of customers under age 21 is 0.68.

Find the mean and standard deviation of.

What is the probability that the sample proportion is within 0.03 of the true proportion of customers who are under age 21?

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