In a mid-size company, the distribution of the number of phone calls answered each day by each of the 12

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 50 and a standard deviation of 3. Using the empirical rule, what is the approximate percentage of daily phone calls numbering between 47 and 53?

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