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Math Help - Trouble understanding

  1. #1
    Junior Member
    Joined
    Oct 2008
    Posts
    54

    Trouble understanding

    Hi,


    today I came across an expression my college claims it tells us about the average index value i of a random variable Xi. The expression is:

    AI = \frac{\sum_{i}^{n} i \times X_{i}}{\sum_{i}^{n} X_{i}}

    However I am having problems understanding it, especially the part about dividing the whole thing with sum of Xi. Could anyone clarify the expression or at least give hers/his own opinion about what AI means/is/stands for?

    thank you

    baxy
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  2. #2
    Junior Member
    Joined
    Oct 2008
    Posts
    54

    Re: Trouble understanding

    no opinions ??
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