| Value | Category | Cases | |
|---|---|---|---|
| 1 | No physics homework | 12 |
6.6%
|
| 2 | 1–15 minutes | 59 |
32.2%
|
| 3 | 16–30 minutes | 59 |
32.2%
|
| 4 | 31–60 minutes | 34 |
18.6%
|
| 5 | 61–90 minutes | 12 |
6.6%
|
| 6 | More than 90 minutes | 7 |
3.8%
|
| Sysmiss | 817 |