Determine Whether the Table Represents a Discrete Probability Distribution $\begin{array} { c l } \hline x & P ( x ) \\\hline - 1 & 0.4 \\0 & 0.3 \\1 & 0.1 \\2 & 0.35 \\\hline\end{array}$

Determine whether the table represents a discrete probability distribution.
$\begin{array} { c l } \hline x & P ( x ) \\\hline - 1 & 0.4 \\0 & 0.3 \\1 & 0.1 \\2 & 0.35 \\\hline\end{array}$