Question: hi have a question on this question i need help showing my work. Here is the statement and the question. A sample of 50 drills

hi have a question on this question i need help showing my work. Here is the statement and the question.

A sample of 50 drills had a mean lifetime 12.68 holes drilled when drilling a low-carbon steel. Assume the population standard deviation is 6.83 holes drilled.

question 1) Calculate the 99% confidence interval for the population mean number of holes drilled by these drills.

thank you for your help

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