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The average monthly electric bill of a random sample of 256 residents of a city is...

The average monthly electric bill of a random sample of 256 residents of a city is $90 with a standard deviation of $24. Construct a 95% confidence interval for the mean monthly electric bills of all residents. (Round to two decimal places) [Answer , Answer ] Construct a 99% confidence interval for the mean monthly electric bills of all residents. (Round to two decimal places) [Answer , Answer ]

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