sigma notation, Basic Statistics

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Given the following pairs of random variables and compute the following sums.
(NB: show your working table).


3 -7 2 10 6

11 10 12 15 14

(b) (c)

(d) ?¦?2y^2 ? (e) ?¦(2y)^2 (f)

(g) (h) (i)

(j) (k) ?¦(x+y)^2 (l) ?¦(x-5)^2

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