Question

In a mid-size company, the distribution of the number of phone calls answered each day by each ofthe 12 receptionists is bell-shaped and has a mean of 61 and a standard deviation of 11. Using theempirical rule (as presented in the book), what is the approximate percentage of daily phone callsnumbering between 50 and 72?

Answer 1

[tex]\begin{gathered} z1=\frac{61-50}{11}=\frac{11}{11}=1 \\ z2=\frac{72-50}{11}=\frac{22}{11}=2 \\ \text{hence,} \\ P(1