題目是:
Suppose that one repairman has been assigned the responsibility of
maintaining four machines. For each machine, the probability distribution of running time before a
break-down is in Poisson's distribution with a mean of eight hours. The repair time has an exponential distribution
with a mean of two hours. Another repairman will come to repair the break-down machine(s)
also, if more than two machines are out of service. Calculate the expected number of machines that
are not running.
圖片連結是:
http://ppt.cc/p2IZ
我的想法是知道 進入率=8, 服務率=2, 而服務人員=1/2...
我想我是要找 L_q 吧?但然後我不知道怎麼入手了,因為不知道state diagram怎麼畫.
請版友指教,謝謝.
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 1.36.66.232