You are estimating the cost of engine overhauls a sample of 99 repairs showed an average

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You are estimating the cost of engine overhauls a sample of 99 repairs showed an average overhaul of 285 hours with a standard deviation of 60 hours. Calculate a 95% confidence interval for the average overhaul.

 

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You are estimating the cost of engine overhauls a sample of 99 repairs showed an average
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