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Noise levels at 5 concerts were measured in decibels yielding the following data: 142,142,123,133,139 Construct the...

Noise levels at 5 concerts were measured in decibels yielding the following data: 142,142,123,133,139 Construct the 99% confidence interval for the mean noise level at such locations. Assume the population is approximately normal. Step 1 of 4 : Calculate the sample mean for the given sample data. Round your answer to one decimal place.

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