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Math Help - Finding the pmf from the distribution function

  1. #1
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    Finding the pmf from the distribution function



    No idea how to do part (a). Can someone please help me? Thanks!
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  2. #2
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    Quote Originally Posted by cirrus74 View Post


    No idea how to do part (a). Can someone please help me? Thanks!
    I think we will have to assume that the possible values of x are integers, then:

    (a) well obviously we have:

    p_X(x)=0,\ x<-1

    and

    p_X(x)=0,\ x \ge 1,

    so that leaves only p_X(-1) and p_X(0) to be determined, can you do that?

    RonL
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  3. #3
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    Well actually, the answer that was given to us was:



    But I don't know how they got it?
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  4. #4
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    Quote Originally Posted by cirrus74 View Post
    Well actually, the answer that was given to us was:



    But I don't know how they got it?
    When F jumps by d_i at x_i, then p(x_i)=d_i

    RonL
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