The pmf of the amount of memory X GB in a purchased flash drive is given as the following 2 4 8 16 p x 0 05 0 20 0 25 0 30 0 20 X 1 a Compute E X in GB Enter your answer to two decimal places 7 05 GB b Compute V X in GB2 directly from the definition Enter your answer to four decimal places 5 11 X GB2 2 26 c Compute the standard deviation of X in GB Round your answer to three decimal places X GB 5 11 d Compute V X in GB2 using the shortcut formula Enter your answer to four decimal places