2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/219600The performance of non-preemptive M/M/1 queueing system with two priority is analyzed. By using complementary variable method to make vector Markov process and analyzing the state-change equations of the queueing system, the generating function of two kinds of customers'length distribution are derived under non-preemptive priority .Through further discussion, the probability of the server that it is working or free and average length of two kinds of customers are also derived.8 pagesOptimization and ControlProbabilitytext