Quiz 10.18.2012. Given the information above calculate: E[X ] = 30 + 7 = 37 Var [X ] = 510.3+1190.7 = 1701 (bonus) Let Y and Z be random variables. Let E[Y] = 2, Var [Y] = 1, E[Z] = 1, and Var [Z] = 1. Find: E[Y + Z ] = E[Y] + E[Z] = 2 + 1 = 3 Var [2Y ] = 2 2 Var[Y] = 2 2 (1) = 4.
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