Drill lifetime: A sample of 50 drills had a mean lifetime of 12.02 holes drilled when drilling a low-carbon steel. Assume the population standard deviation is 6.36. Part: 0/3 Part 1 of 3 he (a) Construct a 95% confidence interval for the mean lifetime of this type of drill. Use tables or technology. Round your answers to at least two decimal places. The confidence interval is 00. X 3

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