Need serious help on stats Watch

mathsRus
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It is part i)
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Ktulu666
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So you know to calculate E[X] you sum xp(x), right? The trouble is, your sum will end up looking like Kxa^x, but (and the proof is beyond my reach as well) it is permissible to use calculus on these sums (I'm dancing around the issue of convergence a little here, would be nice if one of the more experienced users could back me up/correct me). So, xa^x looks alot like a derivative, right? (Hint: take out a factor of a). Then if you have E[X] = sum(d/dx(stuff)), you can write E[X] = d/dx(sum(stuff)), and when you actually work out what these quantities should be, you'll find the second sum is one you recognise
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