Question: Find the expected value of the random variable. The time (in minutes) it takes until Julie's boyfriend calls is a random variable X with density

Find the expected value of the random variable.
The time (in minutes) it takes until Julie's boyfriend calls is a random variable X with density
Fx(x) = 1/10 e-x/10
For 0 < x
and fx(x) = 0 otherwise.

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