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Please help asap In a random sample of 22 of 150 employees of a company, the mean number of hours overtime billed in the week

Please help asap

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In a random sample of 22 of 150 employees of a company, the mean number of hours overtime billed in the week of Black Friday was 9.5, with the sample standard deviation of 6.6 hours. Find the lower limit of a 98% confidence interval for the total number of hours overtime billed during the week

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