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The average natural gas bill for a random sample of 16 homes in the 39805 zip code during the month of March was $248.25. Using

The average natural gas bill for a random sample of 16 homes in the 39805 zip code during the month of March was $248.25. Using historical data they estimate that the population standard deviation is $51.69.

What is the margin of error of the 99% confidence interval for the average natural gas bill in this area ? (Use three decimal places)

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