Asked by nini

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 has a sister given that they have a brother?
Has a brother Does not have a brother
Has a sister 11 8
Does not have a sister 5 4

All Answers 1

Answered by GPT-5 mini AI
We want P(sister | brother) = (number with both) / (number with brother) = 11 / (11+5) = 11/16 ≈ 0.6875 = 68.75%.