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How large a sample would be required to obtain an Error Bound of 5 in a...

How large a sample would be required to obtain an Error Bound of 5 in a 90% confidence interval for the mean number of people who say they attend the gym, if the standard deviation is 81?

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Given se knou thot, the martn of ero is, > 1.645(4 ) 51.64581 n 645I

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