A tax assessor wants to estimate the mean property tax bill for all (1) homeowners living in Madison, Wisconsin. A survey completed three years ago indicated that the mean and standard deviation were...

Extracted text: A tax assessor wants to estimate the mean property tax bill for all (1) homeowners living in Madison, Wisconsin. A survey completed three years ago indicated that the mean and standard deviation were $1200 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 o.85?