QuestionPractice Exercises 1) Which of the following are valid probability distributions? Explain a) \begin{tabular}{|c|c|} \hline $\boldsymbol{x}$ & $\boldsymbol{P}(\boldsymbol{x})$ \\ \hline 0 & 0.5 \\ \hline 1 & 0.25 \\ \hline 2 & 0.25 \\ \hline \end{tabular} b) \begin{tabular}{|c|c|} \hline $\boldsymbol{x}$ & $\boldsymbol{P}(\boldsymbol{x})$ \\ \hline 0.5 & 0.2 \\ \hline 0.2 & 0.3 \\ \hline 0.3 & 0.25 \\ \hline \end{tabular} c) \begin{tabular}{|c|c|} \hline $\boldsymbol{x}$ & $\boldsymbol{P}(\boldsymbol{x})$ \\ \hline 0 & 0.3 \\ \hline 1 & 0.25 \\ \hline 2 & 0.25 \\ \hline 3 & 0.2 \\ \hline \end{tabular}