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    Probability density function

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    #4. The probability density function of X, the lifetime of a certain type of electronic device (measured in hours), is given by

    f (x) = 10/x2 x > 10
    f (x) = 0 x ≤ 10

    (a) Find P{X > 20}.
    (b) What is cumulative distribution function of X?
    .. (see attachment)

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    https://brainmass.com/statistics/probability-density-function/probability-density-function-31284

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    this shows how to find the cumulative distribution function.

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