The probability that a student who does not have a brother has a sister is 53.33%.
Probability
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:
- 20 - 5 = 100
- 11 - 3 = X
- 15 = 100
- 8 = X
- 8 x 100 / 15 = X
- 800 / 15 = X
- 53.33 = X
Therefore, the probability that a student who does not have a brother has a sister is 53.33%.
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