|x||P(X = x)||y||P(Y = y)|
(i) if E(X) = 10, what are x1, x2, and Var(X)?
(ii) if y1 + y2 = 25 and E(Y) =7.5, what is Var(Y)?
(iii) suppose X and Y are independent. What are Var(X – Y) and SD(X – Y)?
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