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    Probability of Lamp Failure

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    A lamp has two bulbs, each of a type with an average lifetime of 6 hours. The probability density function for the lifetime of a bulb is f(t) =(1/6) e^(-t/6), t <= 0.
    What is the probability that both of the bulbs will fail within 3 hours?

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    https://brainmass.com/math/probability/probability-lamp-failure-103365

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    A lamp has two bulbs, each of a type with an ...

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