| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very Easy | 59 |
2.5%
|
| 2 | Easy | 459 |
19.1%
|
| 3 | Difficult | 899 |
37.5%
|
| 4 | Very Difficult | 473 |
19.7%
|
| 9 | Don’t know | 509 |
21.2%
|