Consider a random experiment of tossing a biased coin three times. We assume that the tosses are indepen- dent of each other and the probability of a head is 0.2. Let X be the random variable whose value represents the number of eads obtained. c) (12 pts) Let X; be an indicator random variable, whose value is 1 if the i-th toss resulted in heads Define X in terms of X's and compute E[X] using this expression. Show your work