Question: Let f be a probability function of a random variable X defined by f (x) = cx, RX = {1, 2, 3}. Then, the expected

Let f be a probability function of a random variable X defined by f (x) = cx, RX = {1, 2, 3}.

Then, the expected value of X equals

(a) 7∕6 (b)7∕3 (c)1∕6 (d)7∕2

(e) 14∕9

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