Customers arrive at an automated coffee vending machine at a rate of 4 per minute, following a Poisson distribution.

Customers arrive at an automated coffee vendingmachine at a rate of 4 per minute, following a Poissondistribution. The coffee machine dispenses a cup ofcoffee in exactly 10 seconds.What is the average number of people waiting inline?What is the average number in the system?How long does the average person wait in linebefore receiving service?