Need Help ASAP, will upvote

(20 points) Problem 1: The following data yield the arrival times and service times that each customer will require, for the first 4 customers at a single server queue system. Upon arrival, a customer either enters service if the server is free or joins the waiting line. When the server completes work on a customer, the next one in line (i.e. the one who has been waiting the longest) enters the service. The studied period ends until the last customer leaves the system. Arrival Times: 11,25,57,72 Service Times: 15,27,49,39 By hand or Excel (show your simulation table to receive full credit): (a) (5 points) Plot the number of parts in system over time. (b) (5 points) Determine the departure times of these four parts. (c) (5 points) Determine the expected waiting time of parts. (d) (5 points) Determine the expected number of customers waiting in the queue