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Thread: Discrete Random Variable

  1. #16
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    Re: Discrete Random Variable




    Any ideas guys, this homework assignment is due tonight and need to submit it soon

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    Re: Discrete Random Variable

    So I am still trying to provide hints so that you can apply the method mentioned by Dason at #8 (as you claim you understand that)

    Maybe another question: Can you show that the sum of the pmf of a Geometric distribution equals to 1?

  3. #18
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    Re: Discrete Random Variable



    I understand that all the vals must add up to 1 but when i take the formula i get the following:
    s=1((1-3^n)/(1-3))
    -2s=1-3^n
    S=(1-3^n)/2

    where s=c BUT that doesnt give me a value because n is still unknown, i dont know why im having this much trouble with this problem heh.

  4. #19
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    Re: Discrete Random Variable

    n isn't unknown. Read your problem again. You have a finite number of terms that you're summing over.
    I don't have emotions and sometimes that makes me very sad.

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    Re: Discrete Random Variable

    Also note that r isn't 3. You're pdf is of the form f(X=x) = c/x so you want to sum 1 + 1/3 + 1/3^2 + ... 1/3^m
    I don't have emotions and sometimes that makes me very sad.

  6. #21
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    Re: Discrete Random Variable

    so n = 1 ?

    This is where im confused.

  7. #22
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    Re: Discrete Random Variable


    Got it figured out thanks.

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