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Question
Given below are the cumulative frequencies showing the weights of 685 students of a school. Prepare a frequency distribution table.
| Weight (in kg) | No. of students |
| Below 25 | 0 |
| Below 30 | 24 |
| Below 35 | 78 |
| Below 40 | 183 |
| Below 45 | 294 |
| Below 50 | 408 |
| Below 55 | 543 |
| Below 60 | 621 |
| Below 65 | 674 |
| Below 70 | 685 |
Solution
| Weight (in kg) | No. of students | Class interval | Frequency |
| Below 30 | 24 | 25-30 | 24-0=24 |
| Below 35 | 78 | 30-35 | 78-24=54 |
| Below 40 | 183 | 35-40 | 183-78=105 |
| Below 45 | 294 | 40-45 | 294-183=111 |
| Below 50 | 408 | 45-50 | 408-294=114 |
| Below 55 | 543 | 50-55 | 543-408=135 |
| Below 60 | 621 | 55-60 | 621-543=78 |
| Below 65 | 674 | 60-65 | 674-621=53 |
| Below 70 | 685 | 65-70 | 685-674=11 |
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