# Thread: [SOLVED] Moment for an mgf

1. ## [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

2. Originally Posted by Amazed
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 $M(0) \neq 1$.

3. I just made up this mgf for the sake of example.

Thanks

4. Originally Posted by Amazed
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.