QuestionConditional Probability from a Table Score: $2 / 5$ Penalty: 1 off
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In a class of students, the following data table summarizes how many students have a brother a sister. What is the probability that a student has a brother given that they have a sister? \begin{tabular}{|c|c|c|} \hline & Has a brother & Does not have a brother \\ \hline Has a sister & 3 & 20 \\ \hline Does not have a sister & 2 & 4 \\ \hline \end{tabular}
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