| Value | Category | Cases | |
|---|---|---|---|
| 1 | 13 | 4 |
3.1%
|
| 2 | 14 | 12 |
9.2%
|
| 3 | 15 | 37 |
28.5%
|
| 4 | 16 | 37 |
28.5%
|
| 5 | 17 | 23 |
17.7%
|
| 6 | 18 | 7 |
5.4%
|
| 7 | 19 | 7 |
5.4%
|
| 8 | 20 | 1 |
0.8%
|
| 9 | 21 | 2 |
1.5%
|
| 10 | Age of the student | 0 |
0%
|