The frequency distribution :
| Marks | 0-20 | 20-40 | 40-60 | 60-100 |
| Number of Students | 10 | 15 | 20 | 25 |
has been represented graphically as follows :
Do you think this representation is correct? Why?
Given :
| Marks | 0-20 | 20-40 | 40-60 | 60-100 |
| Number of Students | 10 | 15 | 20 | 25 |
| Class interval (x-axis) | Frequency (y-axis) |
| 0-20 | 10 |
| 20-40 | 15 |
| 40-60 | 20 |
| 60-100 | 25 |
The above will be plotted as:
Hence, the given graph is correct.