December 29th, 2008, 04:44 AM
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 | Flow Master | | Join Date: Dec 2007 Location: Zeitgeist
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Quote:
Originally Posted by mr fantastic  I have time for Q19 (i) and (ii):
Mean: 
Variance: ![Var(X) = E(X^2) - [E(X)]^2](http://www.mathhelpforum.com/math-help/latex2/img/94a686c6fa202a524eedc6eb07e614d7-1.gif "Var(X) = E(X^2) - [E(X)]^2") . 
(iii) You should do some research. | Regarding (iii):
1. Read this (well I think it's funny and it's something I didn't know): Urban Dictionary: grauniad
2. Read this regarding iii (c): Poisson distribution
3. Read this regarding iii (a): Poisson process - Wikipedia, the free encyclopedia
Now read this: Poisson distribution - Wikipedia, the free encyclopedia
So which option does that leave ....?
__________________ There are two things you should never try to prove: the impossible and the obvious. The greater danger for most of us lies not in setting our aim too high and falling short; but in setting our aim too low and achieving our mark. (Michelangelo Buonarroti)
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