→ tibicos :expected lifetime 是指lifetime的期望值（平均值） 04/06 07:52
A system to function as long as at least 3 of its 5 processors continue
to operate. Suppose processors lifetime are exponentially distributed
with mean L. Find the expected system lifetime.
這題我有幾個地方不確定他真正的意思
as long as at least 3 of its 5 processors 是指五個裡面至少要取三個的意思嗎?
如果是的話 那是不是有三種情況 : 取三種 ,取四種,和取五種?
第二
題目最後說 Find the expected system lifetime 是要求什麼? 是P[3<=X<=5]?
如果題目改成A system to function as long as 3 of its 5 processors
那是不是表示從五個當中只要取三個就可以了??
如果題目又問算此系統的PDF? 那又是要算甚麼?
不好意思
問題多了點
請大家幫忙
謝謝大家
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 155.246.179.193