How to make this expected value symbol? [duplicate]

I'd like to know how to make in mathmode this fat 'E' as a symbol for expected value?

Perhaps you need

\mathbf{E}.


Does this solve?

 \documentclass{article}
\begin{document}
$\mathbf{E}(\xi)=\int_Z\xi d\rho$
\end{document}

• Yes! That's exactly what I was looking for. Thank you! – ltw May 5 '15 at 10:01