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The average zinc concentration recovered from a sample of measurements taken in 12 different locations in a river is found to be 3.1 grams per milliliter. Assume that the population standard deviation is 1.8 gram per milliliter. Determine the lower limit of the 72.86% confidence intervals for the mean zinc concentration in the river. [The answer should be a number rounded to five decimal places, don't use symbols such as %] Determine the upper limit of the 72.86% confidence intervals for the mean zinc concentration in the river. [The answer should be a number rounded to five decimal places, don't use symbols such as %] Next page + 19