96. Consider writing onto a computer disk and then sending it through a certi er that counts

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96. Consider writing onto a computer disk and then sending it through a certi er that counts the number of missing pulses. Suppose this number X has a Poisson distribution with parameter l.2. (Suggested in Average Sample Number for Semi-

Curtailed Sampling Using the Poisson Distribution, J. Qual. Tech., 1983: 126—129.)

a. What is the probability that a disk has exactly one missing pulse?

b. What is the probability that a disk has at least two missing pulses?

c. If two disks are independently selected, what is the probability that neither contains a missing pulse?

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