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what does mean E(X2i) means E(even) ?

It means \[E(X _{i}^{2})\]
Sorry about the notation - it didn't copy and paste correctly.

oh got

so S is sigma(i)=1100Xi is it right

|dw:1392444372176:dw|

but it is not the answer because the problem wants var(s) but i dont know what is exact s?

Sorry, \[S=\sum_{i=1}^{100}X _{i}\]

|dw:1392445311784:dw|

|dw:1392445440041:dw|

|dw:1392445541588:dw|

I can't see the right side of what you did.

How'd you get n^2-n?

|dw:1392447809874:dw| How'd you get this part?

all is n^2 so you have to subtract from n (x1 x2 .. xn)

all term in sigma without itself terms

Suppose that (X,Y) is uniformly chosen from the set given by \[0