| S/N | A | B | C |
| 1 | 70 | 85 | 60 |
| 2 | 75 | 80 | 70 |
| 3 | 75 | 70 | 55 |
| 4 | 80 | 80 | 60 |
| 5 | 75 | 85 | 70 |
| 6 | 70 | 90 | 70 |
| 7 | 70 | 75 | 70 |
| 8 | 75 | 80 | 70 |
| 9 | 70 | 85 | 55 |
| 10 | 75 | 85 | 60 |
| 11 | 70 | 80 | 70 |
| 12 | 70 | 70 | 70 |
| 13 | 75 | 80 | 70 |
| 14 | 75 | 85 | 60 |
| 15 | 75 | 90 | 60 |
| 16 | 75 | 80 | 60 |
| 17 | 70 | 80 | 55 |
| 18 | 70 | 85 | 70 |
| 19 | 75 | 70 | 70 |
| 20 | 80 | 75 | 55 |
| Mean x̅ | 73.5 ± 3A | 80.5 ± 6B | 64 ± 6C |