4-130.The CPU of a personal computer has a lifetime that is

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4-130.The CPU of a personal computer has a lifetime that is exponentially distributed with a mean
4-130.The CPU of a personal computer has a lifetime that
is exponentially distributed with a mean lifetime of six years.
You have owned this CPU for three years.What is the probability
that the CPU fails in the next three years?
4-131.Continuation of Exercise 4-130.Assume that your
corporation has owned 10 CPUs for three years,and assume
that the CPUs fail independently.What is the probability that
at least one fails within the next three years?

一个个人电脑的CPU有一个六年的
服从指数分布的平均寿命.
你已经拥有这CPU三年.这个CPU在未来的三年中坏掉的几率是多少呢?
练习4-130的延伸.假如你的公司拥有的10个CPU已经使用了三年,又假如这些CPU会随机地坏掉.那么在未来三年中至少有一个CPU坏掉的可能性是多少?
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