某超级市场,顾客从货架上挑选各类商品,出门前到柜台前付款。现有两个收款台,若都不空闲,顾客就排成一队,否则
(1)顾客来到数:在相继的26个时段里依次来到付款柜台前的顾客数为:1,3,0,1,0,0,1,1,2,1,0,1,3,2,5,1,2,2,1,0,0,1,0,3,3,1。
(2)付款时间(min:s):4:35,3:02,5:27,4:33,2:35,1:45,0:15,3:45,0:15,4:20,2: 39,4:51,5:45,0:23,2:30,3:26,1:48,1:16,1:24,4:17,3:07,1:40,5:53,2:31,3:28,0:54,0:38,6:55,1:33,6:20,0:59,2:03,1:29,5:24,3:50
试估计该系统的效能。