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Drill lifetime: A sample of 50 drills had a mean lifetime of 12.20 holes drilled...

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Drill lifetime: A sample of 50 drills had a mean lifetime of 12.20 holes drilled when drilling a low-carbon steel. Assume the population standard deviation is 7.02.Part 1 of 3(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 decimalplaces.The confidence interval is Part 2 of 3(b) The manufacturer of the drills claims that the mean lifetime is greater than 13. Does this confidence interval contradict this claim?(Choose one), the confidence interval contains some/does not contain any values greater than 13, so the claim(Choose one) contradicted.

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