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Let X denote the lifetime of a light bulb of a certain brand. Suppose that the...

Let X denote the lifetime of a light bulb of a certain brand. Suppose that the lifetime of a light bulb of this particular brand has an exponential distribution with mean lifetime of 200 hours. What is the probability that a light bulb has a lifetime between 100 and 400 hours?

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The probability that a light bulb has a lifetime between 100 and 400 hours is 0.4712.

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