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Math Help - help with joint distribution

  1. #1
    Senior Member
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    Sep 2009
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    Thumbs down help with joint distribution

    X~Bernoulli(1/4) Y=-7X, whats the cdf for Fxy ?

    My attempt
    ---------

    Fxy = P(X<=x,X<=-y/7) = 0 for min(x,-y/7) < 0
    1/4 for 0 <= min(x,-y/7) < 1
    1 for min(x,-y/7) >= 1


    Is this right?
    Last edited by Sneaky; October 17th 2010 at 12:32 PM.
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