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Math Help - Probability Mass Function

  1. #1
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    Probability Mass Function

    Is the function f(x) = c(x+1)^2 for X = 0, 1, 2, 3, a probability mass function? Explain
    why or why not. I am not exactly sure how you can tell if something is a pmf? I looked in my textbook but it doesn't really explain it so I can understand it. Thanks to anyone who can help.
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  2. #2
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    Re: Probability Mass Function

    It really depends on what 'c' is.

    Do you mean you need to find 'c' s.t f(x) is a pmf?
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  3. #3
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    Re: Probability Mass Function

    I am not entirely sure. The problem doesn't say what 'c' is. I was thinking that it was just a constant. Can you determine if the problem is a pmf if you assume 'c' to be a constant?
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  4. #4
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    Re: Probability Mass Function

    If X=0,1,2,3 only, then \displaystyle \sum_{i=0}^3f(i)= 1
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