Question: Find the variance of the given random variable. The waiting time X, in minutes, until the next green car passes has density fx(x) = l/2-e-x/2,

Find the variance of the given random variable.
The waiting time X, in minutes, until the next green car passes has density
fx(x) = l/2-e-x/2,
for 0 < x,
and fx(x) = 0 otherwise.

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