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Math Help - marginal mass

  1. #1
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    marginal mass

    given that f(x,y) - 1/4 for (x,y)= { (0,0), (1,1),(1,-1),(2,0)} . how do i find the marginal mass functions for x and y?
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  2. #2
    MHF Contributor matheagle's Avatar
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    I assume that minus is an equal sign.
    As in the name, marginal, you sum across.
    So you have 1/4 probability on these 4 points (0,0), (1,1),(1,-1),(2,0)
    P(X=0)=1/4 since X is zero only once at (0,0)
    P(X=1)=1/2 since X is one twice at (1,1),(1,-1)
    Likewise
    P(X=2)=1/4 since X is two only once at (2,0).
    OK, now you do Y.
    Last edited by matheagle; May 18th 2010 at 04:51 PM.
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