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Duncan Marshall kept careful records of the fuel efficiency of his car. After the first 100 times he filled up the tank, he found the

Duncan Marshall kept careful records of the fuel efficiency of his car. After the first 100 times he filled up the tank, he found the mean was 6.7 km per 100 L with a population standard deviation of 0.4 mpg. Compute the 95 percent confidence interval for his fuel efficiency

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