1. Draw Histogram
| Class | Frequency |
| 20 - 25 | 110 |
| 25 - 30 | 170 |
| 30 - 35 | 80 |
| 35 - 40 | 45 |
| 40 - 45 | 40 |
| 45 - 50 | 35 |
Solution:To draw histogram, we first prepare the frequency distribution with boundary points, with central value of each class
| Class | Lower | Upper | Frequency
`f` |
| 20 - 25 | 20 | 25 | 110 |
| 25 - 30 | 25 | 30 | 170 |
| 30 - 35 | 30 | 35 | 80 |
| 35 - 40 | 35 | 40 | 45 |
| 40 - 45 | 40 | 45 | 40 |
| 45 - 50 | 45 | 50 | 35 |
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