Consider a discrete random variable X that takes the values 1, 2, 3, . . .. The probability that X equals 1 is 0.80. The probability that X equals 2 is 0.20(0.80). The probability that X equals 3 is (0.20)2 (0.80), the probability that X equals 4 is (0.20)3 (0.80), and so on . . .. What is the expected value of X?