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(1) (20 pts.) A tax assessor wants to estimate the mean property tax bill for all homeowners living in Madison, Wisconsin. A survey completed three

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(1) (20 pts.) 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 $1800 and $1500. Assuming that the standard deviation is still about $1500, how large a sample of tax records should the tax assessor take in order to estimate the mean correct to within $125 with probability 0.85

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