Let X be a discrete random variable with the following PMF for x = 0.2 for x = 0.4 for x 0.5 for x = 0.8 for x = 1 otherwise Px(x) = 0.1 0.2 0.2 0.3 0.2 0 a. Find Rx, the range of the random variable X. b. Find P(X 0.5). c. Find P(0.25 < X < 0.75). d. Find P(X= 0.2 X < 0.6). =