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An Auto Mechanic Knows the Average Time It Takes to Replace

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An auto mechanic knows the average time it takes to replace a bad car radiator is 70 minutes with a standard deviation of 12 minutes. This average is based on a random sample of 50. Construct a 90% confidence interval for An auto mechanic knows the average time it takes to replace a bad car radiator is 70 minutes with a standard deviation of 12 minutes. This average is based on a random sample of 50. Construct a 90% confidence interval for . ______________ .
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