The mgf is given by

I have the mean as

is this correct??

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- Aug 23rd 2009, 12:32 PMbigdoggymean and variance from mgf
The mgf is given by

I have the mean as

is this correct?? - Aug 23rd 2009, 01:48 PMMoo
Hello,

the best way to spot your mistake is that you show your working ;)

then we'll see what's wrong

for your information, this is the mgf of the geometric distribution - Aug 24th 2009, 04:05 AMbigdoggy
For the mean

and so

and does that look correct? - Aug 24th 2009, 04:10 AMMoo
okay, you changed your result... now it is correct.

and it's positive, because (p is a probability, so necessarily ) - Aug 24th 2009, 04:18 AMbigdoggy
- Aug 24th 2009, 04:20 AMMoo