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In a mid size company the distribution of the number of phone calls answered each day by each of the 12 receptionists is bell shaped

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In a mid size company the distribution of the number of phone calls answered each day by each of the 12 receptionists is bell shaped and has a mean of 53 and a standard deviation of 11 Using the empirical rule as presented in the book what is the approximate percentage of daily phone calls numbering between 20 and 86 Do not enter the percent symbol ans

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