Solve using direct method
Dear Student
Mean = ∑fX/N = 777/50 = 15.54
Regards
| Marks | f | fX |
|---|---|---|
| 20 | 1 | 20 |
| 19 | 2 | 38 |
| 18 | 4 | 72 |
| 17 | 8 | 136 |
| 16 | 11 | 176 |
| 15 | 10 | 150 |
| 14 | 7 | 98 |
| 13 | 4 | 52 |
| 12 | 2 | 24 |
| 11 | 1 | 11 |
| N = 50 | 777 |
Mean = ∑fX/N = 777/50 = 15.54
Regards