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A Gallup poll wants to determine the mean number of books Americans read each year. How many subjects are needed to estimate the average number

A Gallup poll wants to determine the mean number of books Americans read each year. How many subjects are needed to estimate the average number of books Americans read with a margin of error of 0.58 books with 90% confidence? Initial results of the Gallup poll indicate that the population standard deviation is 6.8 books. Round your answer up to the next integer

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