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Math Help - Expectation and variance

  1. #1
    Super Member Anonymous1's Avatar
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    Expectation and variance

    I'm a little confused with this distribution.

    r_{i,j} = \sqrt s\{-1 with probability \frac{1}{2s}, 0 with probability 1-\frac{1}{s}, 1 with probability \frac{1}{2s}\}

    I see that the expectation is 0, but how do I derive the expectation and variance?
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  2. #2
    MHF Contributor matheagle's Avatar
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    what does i and j have to do with the right hand side?
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