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为估计某邮局服务系统的效能,现以3min为一个时段,统计了100个时段中顾客到达的情况及对100位顾客的服务时间
表4-6
到达人数 | 0 1 2 3 4 5 6 |
时段数 | 14 27 27 18 9 4 |
表4-7
服务时间/s | (0,12] | (12,24] | (24,36] | (36,48] | (48,60] |
顾客人数 | 33 | 22 | 15 | 10 | 6 |
服务时间/s | (60,72] | (72,84] | (84,96] | (96,108] | (108,120] |
顾客人数 | 4 | 3 | 2 | 1 | 1 |
服务时间/s | (120,150] | (150,180] | (180,200] | ||
顾客人数 | 1 | 1 | 1 |
设此服务系统为M/M/1排队模型。求系统有关的数量指标。
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