In a scan of a number of books in the college bookstore, you have discovered that it has books that

In a scan of a number of books in the college bookstore, you have discovered that it has books that are new and books that are up to ten years old. How many books must you review to estimate the mean age (in years) of all the books in the bookstore? Assume a 96% degree of confidence that the sample mean will be in error by no more than 0.25 year.

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