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प्रश्न
| Electricity bill (₹) | 0 - 200 | 200 - 400 | 400 - 600 | 600 - 800 | 800 - 1000 |
| Families | 240 | 300 | 450 | 350 | 160 |
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उत्तर
Consider the following table.
| Class (Electricity bill in Rupees) |
Class Mark | Frequency (Number of families) |
| 0 - 200 | 100 | 240 |
| 200 - 400 | 300 | 300 |
| 400 - 600 | 500 | 450 |
| 600 - 800 | 700 | 350 |
| 800 - 1000 | 900 | 160 |
The frequency polygon using the class mark and frequency given in the above table as
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Given below is the frequency distribution of driving speeds (in km/hour) of the vehicles of 400 college students:
| Speed (in km/hr) | No. of Students |
| 20-30 | 6 |
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| 40-50 | 156 |
| 50-60 | 98 |
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60 |
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