| Arrival rate | The expected number of customers that arrive each period.
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| Exponential distribution | A probability distribution often associated with interarrival times.
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| Poisson distribution | Probability distribution often used to describe the number of arrivals during a given time period.
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| Queue | A line of waiting persons, jobs, things, or the like.
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| Queuing system | Consists of three major components: (1) the source population and the way customers arrive at the system, (2) the serving systems, and (3) how customers exit the system.
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| Service rate | The capacity of a server measured in number of units that can be processed over a given time period.
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