And there is one more thing to mention is that there are only a few points on the graph but the
number of observations in the original data is nearly 100. The reason for this condition is that, the data was not observed per seconds, whereas service may vary per second. Therefore, some service time has identical value of time.
d) Identical service facilities (same sales checkout service on each server)
e) No customer leaves the queue without being served
f) Infinite number of customers in queuing system of ICA (i.e. no limit for queue capacity)
g) FIFO (First In First Out) or FCFS (First Come First Serve)