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The average zinc concentration recovered from a sample of zinc measurements in 49 different locations in a river is found to be 4.2 grams per

The average zinc concentration recovered from a sample of zinc measurements in 49 different locations in a river is found to be 4.2 grams per milliliter.Find the 99% confidence intervals for the mean zinc concentration in the river. Assume that the population is normally distributed and that the population standard deviation is 0.4

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