The number of customers coming to a bank between 1:00 and 1:30 p.m. of a normal day

Question:

The number of customers coming to a bank between 1:00 and 1:30 p.m. of a “normal” day has a Poisson with an average of 39 customers during the half hour. The length of time each customer spends with a teller is Exponential with an average of 45.5 seconds. The average time a customer spends in the line waiting is desired to be three minutes. The manager is wondering how many tellers are required during this time period. Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...