| Value | Category | Cases | |
|---|---|---|---|
| 1 | Easy | 1899 |
69.4%
|
| 2 | Somewhat difficult | 754 |
27.6%
|
| 3 | Very difficult | 81 |
3%
|
| 99 | Don't know | 0 |
0%
|
| d | 1 |
0%
|