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Question
Draw the frequency polygon for the following frequency distribution
| Rainfall (in cm) | No. of Years |
| 20 — 25 | 2 |
| 25 — 30 | 5 |
| 30 — 35 | 8 |
| 35 — 40 | 12 |
| 40 — 45 | 10 |
| 45 — 50 | 7 |
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Solution
| Class mark | No. of Years |
| 17.5 | 0 |
| 22.5 | 2 |
| 27.5 | 5 |
| 32.5 | 8 |
| 37.5 | 12 |
| 42.5 | 10 |
| 47.5 | 7 |
| 52.5 | 0 |
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