| Value | Category | Cases | |
|---|---|---|---|
| 0 | 1465 |
69.8%
|
|
| 1 | very easy | 18 |
0.9%
|
| 2 | easy | 89 |
4.2%
|
| 3 | uncertain | 133 |
6.3%
|
| 4 | difficult | 240 |
11.4%
|
| 5 | very difficult | 154 |
7.3%
|