Determine Whether the Following Is a Probability Distribution

Short Answer

Determine whether the following is a probability distribution. If not, identify the requirement that is not
satisfied. $$\begin{array} { | c | c | } \hline x & P ( x ) \\\hline 0 & 0.1296 \\\hline 1 & 0.3456 \\\hline 2 & 0.3456 \\\hline 3 & 0.1536 \\\hline 4 & 0.0256 \\\hline\end{array}$$