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Math Help - [SOLVED] Moment for an mgf

  1. #1
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    [SOLVED] Moment for an mgf

    Hello,

    Can anyone guide me through how to get the moments for the mgf below:

    M(s) = 4/[(3-50s)^2]

    I need to know if this mgf has to be re-written as :

    M(s)= E(e^{4/[(3-50s)^2]})

    and then differentiated to get the moments.

    OR should i just directly differentiate the M(s) = 4/[(3-50s)^2] ?

    Any help would be appreciated.
    Thanks
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  2. #2
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    Quote Originally Posted by Amazed View Post
    Hello,

    Can anyone guide me through how to get the moments for the mgf below:

    M(s) = 4/[(3-50s)^2]

    I need to know if this mgf has to be re-written as :

    M(s)= E(e^{4/[(3-50s)^2]})

    and then differentiated to get the moments.

    OR should i just directly differentiate the M(s) = 4/[(3-50s)^2] ?

    Any help would be appreciated.
    Thanks
    You directly differentiate a mgf to get the moments.

    By the way .... what you have got is NOT a valid mgf since M(0) \neq 1.
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  3. #3
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    I just made up this mgf for the sake of example.

    Thanks
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  4. #4
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    Quote Originally Posted by Amazed View Post
    I just made up this mgf for the sake of example.

    Thanks
    Note for next time: You should have said this in your first post .... Potentially, a lot of time could have been wasted here.
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