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The mean number of hours of sleep that a college student gets per night is 6 hours with a standard deviation of 3 hours. A

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The mean number of hours of sleep that a college student gets per night is 6 hours with a standard deviation of 3 hours. A random sample of forty students is observed. It is of interest to determine the probability that the mean number of hours of sleep per night is less than 5 hours. Identify the correct formula for solving. O P( X

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