Question: Find the variance of the given random variable. Upon arriving at a restaurant and finding that no table is available, Diana and Markus have a

Find the variance of the given random variable.
Upon arriving at a restaurant and finding that no table is available, Diana and Markus have a waiting time X (in hours) with density
Fx(x) = 2e-2x,
for 0 < x,
and fx(x) = 0 otherwise.

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