[hermannj314]

Can you elaborate on your code? Why are you summing the 3 parallel queues total time of processing together? Those processes occur in parallel, so I am uncertain what the sum of times is supposed to represent. Total time to clear all lines? That should be the nearly same number as one line with 3 people processing. So long as all 3 cashiers are constantly engaged, average wait time per customer for the entire system must remain unchanged independent of the queueing system used. Even a LIFO model for processing customers will have the same mean wait time per customer.

I am also very curious why the total time to process 3000 customers with mean time 50 is not closer to 3000*50. Perhaps I have missed something on the technical side.