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Suppose that a printer needs an average of K minutes to print several designs. Given that the standard deviation to print all design is 1.6

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Suppose that a printer needs an average of K minutes to print several designs. Given that the standard deviation to print all design is 1.6 minutes. If a random sample of 40 designs is selected, a. What is the value of K so that there is 99% Chance that the sample mean will be at least 13.60 minutes? b. Find the probability that the sample mean will be below 13.7 or above 14.8 minutes

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