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According to the American Time Use Survey, Americans sleep an average of 7.79 hours each day with a standard deviation of 2.45 hours. Let

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According to the American Time Use Survey, Americans sleep an average of 7.79 hours each day with a standard deviation of 2.45 hours. Let be the average of a random sample of Americans. What sample size will give the standard deviation of equal to 0.31 hours? Round the solution up to the nearest whole number, if necessary. n

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