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 twenty students is observed. It is of interest to determine the probability that the mean number of hours of sleep per night is less t Identify the correct formula for solving. P (X < 5) = P ( Z < (5-6) O P(X < 5) = P (z < ,º) (5-6) 3 O pR

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