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Homework Help: Variance of 36 standard dice rolls

  1. Sep 19, 2004 #1
    So i need to find the variance of a number of dice rolls. I know that i use the following formula:

    ∑ ( X i - µ)2
    i = 1
    σ2 = ---------------

    but i don't know how to use it. I feel really stupid asking this but i am really lost right now. Thanks for any help in advance.
  2. jcsd
  3. Sep 19, 2004 #2

    Claude Bile

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    Science Advisor

    I think N stands for the number of samples (i.e. 36), mu is the mean (which you can calculate easily enough) and X is the value for the ith sample.

    What you are essentially doing is finding the average deviation from the mean.

    You would do well to double check my answer though.

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