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Math Help - checking answer

  1. #1
    Junior Member plm2e's Avatar
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    checking answer

    If f is the prob. density function of a continuous random variable X, then
    (from x to infinity) f(t) dt equals:

    a. P(X ≤ x)
    b. P(X ≥ x)
    c. P(X ≥ t)
    d. P(X = x)
    e. P(X = t)


    I picked B, Im pretty sure about this, but i really do not understand why. can someone help explain to me? thank you
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  2. #2
    Flow Master
    mr fantastic's Avatar
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    Quote Originally Posted by plm2e View Post
    If f is the prob. density function of a continuous random variable X, then
    (from x to infinity) f(t) dt equals:

    a. P(X ≤ x)
    b. P(X ≥ x)
    c. P(X ≥ t)
    d. P(X = x)
    e. P(X = t)


    I picked B, Im pretty sure about this, but i really do not understand why. can someone help explain to me? thank you
    Correct, it's B. This follows from the definition.
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