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A tax assessor wants to estimate the mean property tax bill for all homeowners living in...

A tax assessor wants to estimate the mean property tax bill for all homeowners living in Madison, Wisconsin. A survey completed three years ago indicated that the mean and standard deviation were $1400 and $1000. Assuming that the standard deviation is still about $1000, how large a sample of tax records should the tax assessor take in order to estimate the mean correct to within $100 with probability 0.90?

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