Find the expected value of each random variable shown. a) x 0 1 2       ​ P(X=​x) 0.2 0.3 0.5                   b) x 200 300 400 500     ​ P(X=​x) 0.2 0.1 0.1 0.6     ​a) The expected value is   ​b) The expected value is

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