The mgf is given by

I have the mean as

is this correct??

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- August 23rd 2009, 11:32 AMbigdoggymean and variance from mgf
The mgf is given by

I have the mean as

is this correct?? - August 23rd 2009, 12:48 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 - August 24th 2009, 03:05 AMbigdoggy
For the mean

and so

and does that look correct? - August 24th 2009, 03:10 AMMoo
okay, you changed your result... now it is correct.

and it's positive, because (p is a probability, so necessarily ) - August 24th 2009, 03:18 AMbigdoggy
- August 24th 2009, 03:20 AMMoo