# I do not understand standard deviation nor the empirical rule

**Question description**

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 49 and a standard deviation of 8.
Using the empirical rule (as presented in the book), what is the
approximate percentage of daily phone calls
numbering between 25 and 73?

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