1 2 4 8 16 p(x) | 0.05 0.15 0.25 0.30 0.25 (a) Compute E(X) (in GB). (Enter your answer to two decimal places.) 7.75 GB (b) Compute V(X) (in GB) directly from the definition. (Enter your answer to four decimal places.) 27.7875 GB2 (c) Compute the standard deviation of X (in GB). (Round your answer to three decimal places.) 5.2714 GB (d) Compute V(X) (in GB') using the shortcut formula. (Enter your answer to four decimal places.)

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