| Value | Category | Cases | |
|---|---|---|---|
| 0 | 1465 |
69.8%
|
|
| 1 | very easy | 22 |
1%
|
| 2 | easy | 77 |
3.7%
|
| 3 | uncertain | 163 |
7.8%
|
| 4 | difficult | 219 |
10.4%
|
| 5 | very difficult | 153 |
7.3%
|