1. \(\dfrac{9}{25}\) of students ride the bus to school. Note that
\(\dfrac{9}{25}=\dfrac{9\cdot 2}{25\cdot 2}=\dfrac{18}{50}.\)
2. \(\dfrac{19}{50}\) of students walk to school.
3. The fraction of students that ride the bus or walk to school is
\(\dfrac{18}{50}+\dfrac{19}{50}=\dfrac{18+19}{50}=\dfrac{37}{50}.\)
Answer: the fraction of students that ride the bus or walk to school is \(\dfrac{37}{50}.\)