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A long history of testing water samples in a certain lake has shown that the level of a certain pollutant is approximately normally distributed with

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A long history of testing water samples in a certain lake has shown that the level of a certain pollutant is approximately normally distributed with standard deviation 4.8 mg/L. What is the minimum number of samples required to estimate today's level to within 0.8 mg/L with 95% condence? (Don't forget to round ch to two decimal places!)

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