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Second opinion] Efficiency experts study...

Second opinion] Efficiency experts study the processes used to manufacture items in order to make them as efficient as possible. One of the steps used to manufacture a metal clamp involves the drilling of three holes. In a sample of 90clamps, the mean time to complete this step was 40.4seconds. Assume that the population standard deviation is =8seconds. Round the critical value to no less than three decimal places.A 90%confidence interval for the mean is ___ < mu < ___

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