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A research firm has been contracted to estimate the mean weekly family expenditure on clothes. He believes that the population standard deviation of the weekly

A research firm has been contracted to estimate the mean weekly family expenditure on clothes. He believes that the population standard deviation of the weekly expenditure is $125. Assume a sample of 100 is collected with a mean of 150. What is the upper limit of a 90% confidence interval of the population mean weekly expenditure?

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