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प्रश्न
Construct histograms for following frequency distribution:
| Class Interval | 110-119 | 120-129 | 130-139 | 140-149 | 150-159 |
| Frequency | 15 | 23 | 30 | 20 | 16 |
उत्तर
Steps :
a. Make the class intervals continuous by subtracting 0.5 from the lower limit of each class and add 0.5 to the upper limit of each class.
b. On the x-axis , take 1 cm as 5 units and plot class intervals.
c. On the y-axis, take 1 cm as 5 units and plot frequency.
d. Draw rectangles of histogram as per given data.
| Class Interval | Frequency |
| 109.5-119.5 | 15 |
| 119.5-129.5 | 23 |
| 129.5-139.5 | 30 |
| 139.5-149.5 | 20 |
| 149.5-159.5 | 16 |
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| No. of Students | 4 | 8 | 14 | 19 | 5 |
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Observe the following frequency polygon and write the answers of the questions below it.
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No. of trees planted by each student |
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| 20-25 | 2 |
| 25-30 | 5 |
| 30-35 | 8 |
| 35-40 | 12 |
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| Frequency | 4 | 9 | 17 | 25 | 15 | 8 | 2 |
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| Under 5 | 1 |
| Under 10 | 12 |
| Under 15 | 19 |
| Under 20 | 26 |
| Under 25 | 27 |
| Under 30 | 35 |
| Under 35 | 38 |
| Under 40 | 45 |
| Under 45 | 48 |
| Under 50 | 53 |
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