# Math Help - Expected value conditional

1. ## Expected value conditional

the expected of a probability density function f(x) is given by $E(X) = \int_{-\infty}^{+\infty} xf(x) dx$

What about $E(X | X>a)$ like wise $E(X | X, or even better, what is the general result?

2. Originally Posted by usagi_killer
the expected of a probability density function f(x) is given by $E(X) = \int_{-\infty}^{+\infty} xf(x) dx$

What about $E(X | X>a)$ like wise $E(X | X, or even better, what is the general result?
You need to use the conditional pdf.