Mathematics, 07.03.2020 02:14 love123jones
random sample of the costs of repair jobs at a large muffler repair shop produces a mean of $127.95 and a standard deviation of $24.03. If the size of this sample is 40, which of the following is an approximate 90 percent confidence interval for the average cost of a repair at this repair shop?
(a) 87.4$95.127$
(b) 25.6$95.127$
(c) 45.7$95.127$
(d) 81.30$95.127$
(e) 53.39$95.127$
Answers: 1
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