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Question 18 (6 points) A water supplying company wished to estimate the average amount the private customers pay per month. A random sample of 25

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Question 18 (6 points) 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 90% confidence interval for the population mean payment. O 20.34

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