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How much do students pay, on the average, for textbooks during the first semester of college?...

How much do students pay, on the average, for textbooks during the first semester of college? From a random sample of 400 students the mean cost was found to be $357.75, and the sample standard deviation was $37.89. Assuming that the population is normally distributed, find the margin of error of a 91% confidence interval for the population mean.

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