[填空题]
The following cumulative frequency x akive;07x(b 9qvw3 c6xsjj) diagram shows the distance studen h80w3id4+m lrgcp.lx ts need to travel to get to schogc.r + lh0l83w mxi4dpol.
1. Find the median distance a student travels to school.
2. Find the number of students that travel between 2 $\mathrm{~km}$ and 4 $\mathrm{~km}$ to get to school.
3. Find the percentage of students that travel more than 4.5 $\mathrm{~km}$ to get to school. %