Question: 15. One hundred items are simultaneously put on a life test. Suppose the lifetimes of the individual items are independent exponential random variables with mean

15. One hundred items are simultaneously put on a life test. Suppose the lifetimes of the individual items are independent exponential random variables with mean 200 hours. The test will end when there have been a total of 5 failures. If T is the time at which the test ends, find E[T ] and Var(T ).

15. One hundred items are simultaneously put on a life test. Suppose

15. One hundred items are simultaneously put on a life test. Suppose the life- times of the individual items are independent exponential random variables with mean 200 hours. The test will end when there have been a total of 5 failures. If T is the time at which the test ends, find E[T] and Var(T)

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