#2 A security guard knows that the time it takes to make the rounds in a certain warehouse is a random variable having a normal distribution with a mean of 18 minutes and a standard deviation of 3.2 minutes. What is the probability that the average time a sample of 64 security guards will take to complete the rounds of the warehouse is (a) more than 17 minutes? (b) between 17 and 18.9 minutes?

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