TeX source:

\begin{align*} \begin{array}{c|ccccccc} x & 3 & 4 & 5 & 6 & 7 & 8 & 9 \\ \hline P(x) & 0.04 & 0.10 & 0.26 & 0.31 & 0.22 & 0.05 & 0.02 \end{array} \end{align*}