Quandale D.

asked • 03/24/22

please help with this math probability statistical question

Has a brother Does not have a brother
Has a sister 2 3
Does not have a sister 10 7


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 who does not have a sister has a brother?


Peter R.

tutor
I think the question is really about conditional probability, i.e. given the student does not have a sister, what is the probability that the student has a brother? In that case, there are 17 students w/o a sister, of whom 10 have a brother, so the probability is 10/17.
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03/25/22

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