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