(Answered) The useful life x of a particular kind of machine is a

Statistics

The useful life X of a particular kind of machine is a random variable with density function: f(x)={(2.4/x^2)+1/5 if 3≤x≤6, otherwise 0 where x is the number of years a randomly selected machine stays in use. What is the expected useful life of the machine? (Not 1)

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