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in a random sample of 55 refrigerators, the mean repair cost was $116.00 and the popularion standard deviation is $18.40. construct a 90% confidence interval
in a random sample of 55 refrigerators, the mean repair cost was $116.00 and the popularion standard deviation is $18.40. construct a 90% confidence interval for the population mean repair cost. interpret the results ( round to two decimal places as needed)
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