The pmf of the amount of memory X (GB) in a purchased flash drive was given in

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The pmf of the amount of memory X (GB) in a purchased flash drive was given in Example 3.13 as
The pmf of the amount of memory X (GB) in

Compute the following:
a. E(X)
b. V(X) directly from the definition
c. The standard deviation of X
d. V(X) using the shortcut formula

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