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Thread: discrete probability problems

  1. September 4th 2007, 08:21 AM #1
    rbenito
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    discrete probability problems

    hello,
    can anyone in the forum help me with these 3 discrete probability problems?
    (attached in a pdf document)
    cheers
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  2. September 4th 2007, 01:32 PM #2
    CaptainBlack
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    For part a of the first question you need to find C such that

    <br /> \sum_{r=1}^{\infty} p_k(r)=\sum_{r=1}^{\infty} C(1-P)^{r-1} =1<br />

    as the sum of the pmf should be 1. For 0<P<1 this is a convergent geometric series, and you should be able to write down
    its sum immeadiatly.

    Note \sum_{r=0}^{\infty} q^r = \frac{1}{1-q}, \ \ \mbox{for all }0<q<1

    RonL
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