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A study of 45 bolts of carpet showed that their average length was 78.2 yards. The standard deviation of the population is 1.6 yards. Which

A study of 45 bolts of carpet showed that their average length was 78.2 yards. The standard deviation of the population is 1.6 yards. Which of the following is the 95% confidence interval for the mean length per bolt of carpet?

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