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A hotdog vendor is going to compute a 90% confidence interval for the mean time it takes a hotdog to go bad. They know that

A hotdog vendor is going to compute a 90% confidence interval for the mean time it takes a hotdog to go bad. They know that the population standard deviation is 8.4 days. They would like their confidence interval to have a margin of error of 1 days. What should the sample size be to guarantee this margin of error? Round your answer up to an integer.

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