Arrival rate | The expected number of customers that arrive each period.
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Exponential distribution | A probability distribution associated with the time between arrivals.
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Poisson distribution | Probability distribution for the number of arrivals during each time period.
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Queues | A line of waiting persons, jobs, things, or the like.
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Queuing system | A process where customers wait in line for service.
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Service rate | The number of customers a server can handle during a given time period.
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