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some probability questions

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  • some probability questions

    posted in other forum
    Last edited by sebastianzx6r; November 1 2005, 08:01 AM.

  • #2
    Not sure about finding pmf, but for mean and variance, wouldn't you just find the first and second moments?

    E[X] = .6(1) + .3(5) + .1(10)
    E[X^2] = .6(1^2)+.3(5^2) + .1(10^2)
    Var(X) = E[X^2]-E[X]^2

    For your second question, I think
    E[X+a] = E[X]+a
    Var(X) = Var(X+a)
    Whether you are the lion or the gazelle, when the sun comes up, you better be running.

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