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A manufacturer of bags of cement claims that it fills each bag with at least 50.2 pounds of cement. Assume that the standard deviation of the amount in each bag is 1.2 pounds. The decision rule is to shut down if the sample mean weight for a sample of 40 bags is below 49.8. Suppose that the true mean weight is 50 pounds. Using this decision rule, the probability of a type II error is given by...