Marks | Frequency |
Less than 10 | 5 |
Less than 20 | 20 |
Less than 30 | 45 |
Less than 40 | 80 |
Less than 50 | 100 |
Less than 60 | 115 |
Less than 70 | 125 |
Less than 80 | 130 |
Marks | Class Interval | Frequency (f) |
Cumulative Frequency (c.f.) |
Less than 10 Less than 20 Less than 30 |
0 − 10 10 − 20 20 − 30 |
5 15 25 |
5 20 45 c.f |
Less than 40 | 30 − 40 | (f) 35 | 80 |
Less than 50 Less than 60 Less than 70 Less than 80 |
40 − 50 50 − 60 60 − 70 70 − 80 |
20 15 10 5 |
100 115 125 130 |