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A major public utility company is interested in estimating the average annual utility bill for all commercial customers and assumes that the standard deviation of
A major public utility company is interested in estimating the average annual utility bill for all commercial customers and assumes that the standard deviation of annual utility bills is $1,000, as reported in an earlier study. How many utility bills will have to be sampled to estimate the population average annual utility bill to within $150 with 95% confidence?
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