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7. Posting fees. Weekly postage expenses for your company have a mean of $325 and a standard deviation of $54. Your company has allowed for

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7. Posting fees. Weekly postage expenses for your company have a mean of $325 and a standard deviation of $54. Your company has allowed for $350 postage per week in its budget. (a) What is the probability that the average weekly postage expenses for the past 9 months (assume each month has 4 weeks) exceed the budgeted amount of $350

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