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 |