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Question$\newline$Show Examples$\newline$In a class of students, the following data table summarizes how many students have a brother or a sister. What is the probability that a student chosen randomly from the class does not have a sister?$\newline$\begin{tabular}{|c|c|c|}$\newline$\hline & Has a brother & Does not have a brother \\$\newline$\hline Has a sister & $4$ & $5$ \\$\newline$\hline Does not have a sister & $8$ & $12$ \\$\newline$\hline$\newline$\end{tabular}$\newline$Answer Attempt $2$ out of $2$