Following table shows a frequency distribution for the speed of cars passing through at a particular spot on a high way:
| Class interval \((km/h)\) | Frequency |
| \(30 - 40\) | 3 |
| \(40 - 50\) | 6 |
| \(50 - 60\) | 25 |
| \(60 - 70\) | 65 |
| \(70 - 80\) | 50 |
| \(80 - 90\) | 28 |
| \(90 - 100\) | 14 |
| Class interval \((km/h)\) | Midpoint | Frequency |
| \(30 - 40\) | 3 | |
| \(40 - 50\) | 6 | |
| \(50 - 60\) | 25 | |
| \(60 - 70\) | 65 | |
| \(70 - 80\) | 50 | |
| \(80 - 90\) | 28 | |
| \(90 - 100\) |
14
|