1. An industrial engineer who is studying the clerical staffing of a physicians' group practice must decide whether it requires a full-time phone operator. From historical data, she has determined that the group receives phone calls at the rate of 15 per hour.
a. Find the probability that the group receives exactly 15 calls in a given hour.
b. Find the population mean, the population variace, and the population standard deviation for the number of calls.
Just checkin my answers. I got .1024 for A and 3.875 for B. Not so sure about B.