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In a random sample of 21 of 180 employees of a company, the mean number of hours overtime billed in the week of Black Friday

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In a random sample of 21 of 180 employees of a company, the mean number of hours overtime billed in the week of Black Friday was 9.7, with the sample standard deviation of 6.2 hours. Find the upper limit of a 99% confidence interval for the total number of hours overtime billed during the week. Type your numerical answer here. Numbers only

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