Suppose the random variables X, Y, and Z have the following joint probability distribution. x y z f (x, y, z) 1 1 1 0.05 1 1 2 0.10 1 2 1 0.15 1 2 2 0.20 2 1 1 0.20 2 1 2 0.15 2 2 1 0.10 2 2 2 0.05 1. Determine the following: a. P (X=2). b.
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