A cell phone company wants to determine if its cell tower, which can simultaneously process 20,000 calls, will be able to handle call volume in a rapidly growing area

for the next 5 years. They collect the following data:

The current population serviced by this cell tower is 65,000.

a. If the mean number of concurrent telephone users is 11,000, what is the probability that the tower will be able to handle the call volume 3 years, 4 years, and 5

years from now, assuming that the population of the area grows at 8.3% per year?