1. Draw Frequency polygon
| Class | Frequency |
| 20 - 25 | 110 |
| 25 - 30 | 170 |
| 30 - 35 | 80 |
| 35 - 40 | 45 |
| 40 - 45 | 40 |
| 45 - 50 | 35 |
Solution:To draw Frequency Polygon, we first prepare the following table
| Class | Mid | Frequency
`f` |
| 15 - 20 | 17.5 | 0 |
| 20 - 25 | 22.5 | 110 |
| 25 - 30 | 27.5 | 170 |
| 30 - 35 | 32.5 | 80 |
| 35 - 40 | 37.5 | 45 |
| 40 - 45 | 42.5 | 40 |
| 45 - 50 | 47.5 | 35 |
| 50 - 55 | 52.5 | 0 |
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