The pmf of the amount of memory X (GB) in a purchased flash drive is given as the following.
x | 1 | 2 | 4 | 8 | 16 |
p(x) | 0.05 | 0.15 | 0.30 | 0.45 | 0.05 |
(a) Compute E(X). (Enter your answer to two
decimal places.)
GB
(b) Compute V(X) directly from the definition.
(Enter your answer to four decimal places.)
GB2
(c) Compute the standard deviation of X. (Round your
answer to three decimal places.)
GB
(d) Compute V(X) using the shortcut formula.
(Enter your answer to four decimal places.)
GB2
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