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The life in years of a certain type of electrical switch has an exponential distribution with a mean failure rate of 2/3. What is the

The life in years of a certain type of electrical switch has an exponential distribution with a mean failure rate of 2/3. What is the probability that 12 of these items selected at random from a large lot and subjected to a quality control test, at most 4 will fail during the first six months?

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