5. Suppose that the customers arrive at a hamburger stand at an
average rate of 49 per hour, and the arrivals follow a Poisson
distribution. Joe, the stand owner, works alone and takes an
average of 0.857 minutes to serve one customer. Assume that the
service time is exponentially distributed. a) What is the average
number of people waiting in queue and in the system? (2 points) b)
What is the average time that a customer spends waiting in the...