Question: Eva wants to create a confidence interval for the mean expenditure that people spend on books per year. It is known that the standard deviation

Eva wants to create a confidence interval for the mean expenditure that people spend on books per year.

It is known that the standard deviation of the population is $300. How many people should be surveyed for a 95% confidence interval with a margin of error E = 60 for the mean expenditure on books?

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