Question: Find the variance of the given random variable. Let X be the time, in hours, that Christine spends talking on the telephone. Then X has

Find the variance of the given random variable.
Let X be the time, in hours, that Christine spends talking on the telephone. Then X has density
fx(x) = 3e-3x,
for 0 < x,
and fx(x) = 0 otherwise.

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