APFIVE Variance of the Sum of Random Variables
Consider two discrete random variables X and Y with the following joint probability distribution: P(X=1, Y=2) = 0.1, P(X=1, Y=3) = 0.2, P(X=2, Y=1) = 0.3, P(X=2, Y=2) = 0.4. What is Var(X + Y)?
A
0.9
B
0.24
C
0.65
D
0.81
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