Distribution problem

Can someone help me for part c please. I have done part a and b and you can see if I've done it right. Can someone help me out please?

there is the question and my working out

Original post by farhanaktar

there is the question and my working out

Looks good, apart from the typo where you seems to state

X=0,1,2

twice over even though you mean

Y=0,1,2

for one of them. (or maybe it's just how you write Y's that are a bit too similar to X's)

Anyway,

\mathbb{E}[X] = \displaystyle \sum_{r=0}^2 r f_X(r)

Work it out ?

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