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A Proof for the Queuing Formula: L= λ W

John D. C. Little
Operations Research
Vol. 9, No. 3 (May - Jun., 1961), pp. 383-387
Published by: INFORMS
Stable URL: http://www.jstor.org/stable/167570
Page Count: 5
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A Proof for the Queuing Formula: L= λ W
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Abstract

In a queuing process, let 1/λ be the mean time between the arrivals of two consecutive units, L be the mean number of units in the system, and W be the mean time spent by a unit in the system. It is shown that, if the three means are finite and the corresponding stochastic processes strictly stationary, and, if the arrival process is metrically transitive with nonzero mean, then L=λ W.

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