A fast food arrives at a fast drive through rest restaurant 6 minutes after it opens and then the arrival times for the next four customers in order are 3minutes, 8 minutes, 2 minute, and 5minutes, after which there is a long wait until the next customer arrives. The service times for these first five customers (in order) are eight minutes, six minutes, two minutes, four minutes, and seven minutes.
How does one show a graphical representation growth of customers over 90 minutes? Does one determine the lambda, and mu?