One M/M/3 model

One M/M/6 model

Three M/M/1 models

Three M/M/2 models

Six M/M/1 models

A supermarket pairs each of its three cashiers with an assistant who helps with packing up customers' groceries into bags. Each pair work as a team while customers line up in a single queue for service. Assume customer inter-arrival times to the queue and checkout (billing and packing) service times are exponentially distributed. Cashier Assistant Customer Which queueing model is appropriate to estimate the average amount of time a customer waits in the queue? A supermarket pairs each of its three cashiers with an assistant who helps with packing up customers' groceries into bags. Each pair work as a team while customers line up in a single queue for service. Assume customer inter-arrival times to the queue and checkout (billing and packing) service times are exponentially distributed. Cashier Assistant Customer Which queueing model is appropriate to estimate the average amount of time a customer waits in the queue