A single-phase waiting-line system meets the assumptions of constant service time or M/D/1. Units arrive at this system every 12 minutes on average. Service takes a constant 8 minutes. What is the average length of the queue Lq in units?

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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