3. Suppose a fast food restaurant that reaches on average 100 customers per hour. Herself has capacity to serve on average 150 customers per hour It is known that customers wait on average 2 minutes in the queue Calculate system performance measures. a) What is the probability that the system is idle? b) What is the probability that a customer will arrive and have to wait, because the system is busy? c) What is the average number of customers in the queue? d) What is the probability that there are 10 customers in the queue?