Sydewise4290 Sydewise4290

06-06-2023
Mathematics

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The average monthly electric bill of a random sample of 256 residents of a city is $118 with a standard deviation of $35. (a) Construct a 90% confidence interval for the mean monthly electric bills of all residents (in dollars). (Round your answers to the nearest cent.) $ to $ (b) Construct a 95\% confidence interval for the mean monthly electric bills of all residents (in dollars). (Round your answers to the nearest cent.) $ to $

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