The following table simulates a queuing system. Customers arrive one at a time. Time is measured in minutes, e.g., Time Between Arrivals and Service Time are stated in minutes. Use the information in the table to fill in the missing values. Then, use your numbers to answer the following question Customer Interarrival Arrival time number time 0 ? (X) 1 2 3 4 12 2 0 ? 4 6 Service start Waiting Service time time duration 0 0 1 ? 0 ? 5 9 2 2 ? (Y) ? (Z) Departure time 2 57. 5 ? ? Time in the system 2 22.6 2 ? 6 What is the value of Z, i.e., the service duration for Customer 4?