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In a random sample of 24 of 205 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 24 of 205 employees of a company, the mean number of hours overtime billed in the week of Black Friday was 11.5, with the sample standard deviation of 7.2 hours. Find the lower limit of a 95% confidence interval for the total number of hours overtime billed during the week

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