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Math Help - [SOLVED] Variance

  1. #1
    Junior Member
    Joined
    Mar 2009
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    69

    Question [SOLVED] Variance

    Hi everyone!
    Please help me, finding the Variance of the following question:


    As an advertising campaign, a chocolate factory places golden tickets in some of its candy bars, with the promise that a golden ticket is worth a trip through the chocolate factory, and all the chocolate you can eat for life. If the probability of finding a golden ticket is 1/571, find the mean and the variance of the number of candy bars you need to eat to find a ticket.

    1. Mean: 571
    2. Variance: ?

    (I've already found Mean as 571 which is correct but I couldn't find the Variance...)
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  2. #2
    Newbie
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    Dec 2008
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    570*571
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