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Math Help - Probabilty Mass Functions

  1. #1
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    Probabilty Mass Functions

    I have this discrete random varible X with possible values -2,1,3,4 with probabilities satisfying P(X=-2)=P(X=1)=2P(X=3)=3P(X=4).

    and need to Find the probabilty mass function.

    I can not get the probabilty mass function to equal 1 when putting into table form. Can anyone help??
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  2. #2
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    Re: Probabilty Mass Functions

    Hey wrexlive1.

    Can you show us your working out? (Hint: try setting the equation in terms of one probability and solve by using the summation = 1) [The answer as a fraction has a 17 in the denominator).
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