In a random sample of 39 criminals convicted of a certain​ crime, it was determined that...

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In a random sample of 39 criminals convicted of a certain​crime, it was determined that the mean length of sentencing was 57​months, with a standard deviation of 7 months. Construct a 95​%confidence interval for the mean length of sentencing for thiscrime.

the 95​% confidence interval is ​(?,?)

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