A finite population waiting line model has an average service time T of 100 minutes and an average time between service requirements U of 400 minutes; the service factor X is 0.25.

A queueing model is constructed so that queue lengths and waiting time can be predicted. is generally considered a branch of operations research because the results are often used when making business decisions about the resources needed to provide a service.
A queuing system is characterised by three components: Arrival process - Service mechanism - Queue discipline.

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