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A water supplying company wished to estimate the average amount the private customers pay per month. A random sample of 25 customers' bills produced a

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A water supplying company wished to estimate the average amount the private customers pay per month. A random sample of 25 customers' bills produced a sample mean of $30. Suppose that the population standard deviation is known and equals $5. a) Find a 95% confidence interval for the population mean payment. O 13.36

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