Class Intervals | 30−40 | 40−50 | 50−60 | 60−70 | 70−80 |
Frequency | 120 | ? | 200 | ? | 185 |
Cumulative Frequency | 120 | ? | ? | ? | 900 |
Class Intervals Wages | Frequency(f) | Cumulative Frequency |
30−40 | 120 | 120 |
40−50 | f1 | 120+f1 |
50−60 | 200 | 320+f1 |
60−70 | f2 | 320+f1+f2 |
70−80 | 185 | 900 |