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Thread: expectation and variance

  1. Feb 27th, 2006, 10:32 AM #1
    munday63
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    expectation and variance

    Hi can anyone help me with this question

    A sequence of identicak and independent benoulli trials, each with probability p of success, is performed. Let the random variable X be the number of trials up to and including the nth success.

    By expressing X as a sum of geometricrandom variables, or otherwise, find the expectation and variance of X.
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  2. Feb 27th, 2006, 12:33 PM #2
    fahad k
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    Re: expectation and variance

    I guess we can use Binomial distribution.(check?)

    Expectation = np
    Variance=np(1-p)
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  3. Feb 28th, 2006, 04:59 AM #3
    munday63
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    Re: expectation and variance

    i dont think so.

    any other ideas?
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