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Math Help - Prob & Stats

  1. #1
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    Prob & Stats

    I need help with finding the Mean and the Sigma 2 can anyone explain to me how this is done????

    Let the pmf of X be defined by :----------> x|0|1|2|3|
    f(x) |.2|.3|.4|
    Compute M and O2

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  2. #2
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    Unfortunately, you have not supplied the entire distribution. You have four values, but only three probabilties. There remain 10% missing.

    For the mean, simply multiply and add

    Value * Probability of the Value

    For the Variance, it is only slightly different. Add these:

    (Value^2) * Probability of the Value
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  3. #3
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    well part of the problem is finding that missing probability. How would you go about doing that?
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