The probability that a student who does not have a brother has a sister is 53.33%.
Given that in a class of 20 students, 5 have a brother and 11 have a sister, and there are 3 students who have a brother and a sister, to determine what is the probability that a student who does not have a brother has a sister the following calculation must be performed:
Therefore, the probability that a student who does not have a brother has a sister is 53.33%.
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