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Math Help - geometric moment generating function

  1. #1
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    geometric moment generating function

    hi guys,
    i guess this is a basic question but you calculate the first and the second moment from this formula:

    mx(t) = ((1/10)e^t)/(1-(9/10)e^t)

    i think i'm missing some crucial part of this thing.

    thanks
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  2. #2
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    Quote Originally Posted by jamborta View Post
    hi guys,
    i guess this is a basic question but you calculate the first and the second moment from this formula:

    mx(t) = ((1/10)e^t)/(1-(9/10)e^t)

    i think i'm missing some crucial part of this thing.

    thanks
    You evaluate the first and second derivatives at t = 0 (assuming you mean moments about the origin).
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