The average monthly electric bill of a random sample of 256 residents of a city is $90 with a standard deviation of $24

a. Construct a 90% confidence interval for the mean monthly electric bills of all residents.
b. Construct a 95% confidence interval for the mean monthly electric bills of all residents.

a. 87.5325 to 92.4675
b. 87.06 to 92.94

Business

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