Lydiac78471 Lydiac78471

23-12-2022
Mathematics

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noise levels at 3 volcanoes were measured in decibels yielding the following data:142,113,135construct the 90% 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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