The probability that the student who does not have a brother has a sister is: Probability = 2/27
How to find the probability?
From the given table, we see that:
Total number of people in the survey = 3 + 2 + 10 + 12 = 27
Number of students that do not have a brother but have a sister is:
Number = 2
Thus:
The probability that the student who does not have a brother has a sister is: Probability = 2/27