probability density

Posted by mohdsahilali on
URL: http://discussion-forum.276.s1.nabble.com/probability-density-tp5059394.html

Let X be a random variable denotinig the sentence in years for people convicted of a car theft. Suppose max sentence is =3 yrs and probability density function is given by (1/9) . x^2 What is the expected prison sentence after stealing a car?

i need to know how to start going about solving a probability density question!!