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The group wants to estimate the average bill for july to

A consumer group wishes to estimate the average electricity bills for the month of July for single-family homes in a large city. Based on studies conducted in other cities, the standard deviation is assumed to be $25. The group wants to estimate the average bill for July to within $5 of the true average with 99% confidence. What size sample is needed?

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Finance Basics: The group wants to estimate the average bill for july to

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