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<P>This paper shows that in the M/D/∞ queueing system with service time S, the optimal way to estimate the expected number in the system is by sampling the system at time 0, S, 2S, ', kS. In this way, the best unbiased estimate from a sampling interval of length T = kS can be obtained.</P>

Technical Note—The Optimal Estimation of the Expected Number in aM/D/∞ Queueing System