## Precalculus (6th Edition) Blitzer

The probability that a randomly selected student is from a low-income family among people who attend public college is $\frac{10}{21}$.
We know that the probability that a student is from a low income family among those who attend public college is: \begin{align} & \text{P}\left( \text{low income, among public college students} \right)\text{ = }\frac{\text{students from low income family}}{\text{students attend public college}} \\ & =\frac{120}{252} \\ & =\frac{10}{21} \end{align}