A company wants to test a randomly

selected sample of n water specimens and estimate the mean daily rate of pollution produced by a mining operation. If the company wants a 90% confidence interval estimate with a margin of error of 1.3

milligrams per liter​ (mg/L), how many water specimens are required in the​ sample? Assume prior knowledge indicates that pollution readings in water samples taken during a day are approximately normally distributed with a standard deviation equal to 5mg/L.

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