Question: Find the variance of the given random variable. When meeting a friend at a coffee house, Donald sees that his friend has not yet arrived,

Find the variance of the given random variable.
When meeting a friend at a coffee house, Donald sees that his friend has not yet arrived, so he assumes that his friend's arrival time, X, in minutes, will have density
fx(x) = 1/5
for 0 ≤ x ≤ 5
and fx(x) = 0 otherwise

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