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Question
Show the following data by a frequency polygon:
| Electricity bill (₹) | Families |
| 200 – 400 | 240 |
| 400 – 600 | 300 |
| 600 – 800 | 450 |
| 800 – 1000 | 350 |
| 1000 – 1200 | 160 |
Solution
To draw frequency Polygon, we first prepare the following table
| Class | Mid | Frequency |
| 0 – 200 | 100 | 0 |
| 200 – 400 | 300 | 240 |
| 400 – 600 | 500 | 300 |
| 600 – 800 | 700 | 450 |
| 800 – 1000 | 900 | 350 |
| 1000 – 1200 | 1100 | 160 |
| 1200 – 1400 | 1300 | 0 |
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| 16 | 20 | 26 | 27 | 28 |
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| 42 | 43 | 46 | 46 | 47 |
| 48 | 49 | 50 | 53 | 58 |
| 59 | 60 | 64 | 52 | 20 |
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| 40 - 50 | 2 |
| 59 - 60 | 8 |
| 60 - 70 | 12 |
| 70 - 80 | 14 |
| 80 - 90 | 8 |
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(Use a graph paper for this question.) The daily pocket expenses of 200 students in a school are given below:
| Pocket expenses (in ₹) |
Number of students (frequency) |
| 0 - 5 | 10 |
| 5 - 10 | 14 |
| 10 - 15 | 28 |
| 15 - 20 | 42 |
| 20 - 25 | 50 |
| 25 - 30 | 30 |
| 30 - 35 | 14 |
| 35 - 40 | 12 |
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| 32 | 64 | 50 | 54 | 42 | 48 | 22 | 37 | 59 | 63 |
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The graphical representation of ungrouped data is ________
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| 18 – 20 | 4 |
| 20 – 22 | 8 |
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| 26 – 28 | 6 |
| 28 – 30 | 8 |
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