2. Example-2
2. Draw Frequency curve with the help of Histogram
| Class | Frequency | | 10 - 20 | 15 | | 20 - 30 | 25 | | 30 - 40 | 20 | | 40 - 50 | 12 | | 50 - 60 | 8 | | 60 - 70 | 5 | | 70 - 80 | 3 |
Solution:To draw Frequency Polygon, we first prepare the following table| Class | Mid | Frequency
`f` | | 0 - 10 | 5 | 0 | | 10 - 20 | 15 | 15 | | 20 - 30 | 25 | 25 | | 30 - 40 | 35 | 20 | | 40 - 50 | 45 | 12 | | 50 - 60 | 55 | 8 | | 60 - 70 | 65 | 5 | | 70 - 80 | 75 | 3 | | 80 - 90 | 85 | 0 |
To draw histogram, we first prepare the frequency distribution with boundary points, with central value of each class| Class | Lower | Upper | Frequency
`f` | | 10 - 20 | 10 | 20 | 15 | | 20 - 30 | 20 | 30 | 25 | | 30 - 40 | 30 | 40 | 20 | | 40 - 50 | 40 | 50 | 12 | | 50 - 60 | 50 | 60 | 8 | | 60 - 70 | 60 | 70 | 5 | | 70 - 80 | 70 | 80 | 3 |
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