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    				| 1. | 
                                    If E(X) = 5, E(Y) = 2, E(XY) = 11, then find Cov(X,Y). | 
                            
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Answer»  We know that Cov(X, Y) = E(XY) – E(X).E(Y) = 11 – (5) (2)=11 -10= 1.  | 
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