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What is the probability that a bulb purchased

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The time to failure in months, X, of the light bulbs produced at two manufacturing plants A and B obeys exponential distribution with means 5 and 2 months respectively. Plant B produces three times as many bulbs as plant A. The bulbs indistinguishable to eye are intermingled and sold. What is the probability that a bulb purchased at random will burn at least 5 months?

Reference no: EM132465190

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