The Office of Student Services at a large western state university maintains information on the study habits of its full-time students. Their studies indicate that the mean amount of time undergraduate students study per week is 20 hours. The hours studied follows the normal distribution with a population standard deviation of six hours. Suppose we select a random sample of 100 current students. What is the probability that the mean of this sample is between 19 hours and 20 hours?   Multiple Choice 0.0475 0.4525 0.4515 0.0485

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