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Noise levels at 3 airports were measured in decibels yielding the following data: 158,140,147 Construct the...

Noise levels at 3 airports were measured in decibels yielding the following data: 158,140,147 Construct the 98% confidence interval for the mean noise level at such locations. Assume the population is approximately normal. Step 4 of 4 : Construct the 98% confidence interval. Round your answer to one decimal place.

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