作者xotis (waiting for you  )
看板Statistics
标题[问题] 一题分配的问题，题目有点看不懂
时间Thu Nov 23 14:10:20 2006
1.The time T required to repair a machine is an exponentially
distributed random variable with mean 1/2 (hours)
(a)What is the probability that a repair time exceeds 1/2 hour?
1
(b)What is the probability that a repair takes at least 12--- hours
2
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