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The finish times (in minutes) of all Montrealers who ran the marathon follows an unknown distribution with mean and standard deviation = 100. Suppose that

The finish times (in minutes) of all Montrealers who ran the marathon follows an unknown distribution with mean and standard deviation = 100. Suppose that we observe the finish times of 100 runners, and obtain a confidence interval for which is equal to 400 15. What is the confidence level used for this interval (hint: it does not have to be 90% or 95%)?

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