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Weekly expenses for postage on direct mail marketing has a mean of $312 and a standard deviation of $58. Your company has a budget of

Weekly expenses for postage on direct mail marketing has a mean of $312 and a standard deviation of $58. Your company has a budget of $400 per week.

a. What is the approximate probability that the weekly average for the past 52 weeks will exceed the budgeted amount?

b. What information would be needed to estimate the probability of exceeding the budget for a single week? Why was this not needed for A?

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