Explain Why the Following Is or Is Not a Valid $x$

Essay

Explain why the following is or is not a valid probability distribution for the discrete random variable $x$

$$\begin{array} { | c | c | c | c | c | c | } \hline x & 1 & 3 & 5 & 7 & 9 \\\hline p ( x ) & .1 & .1 & .2 & .1 & .2 \\\hline\end{array}$$