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Question
Construct a frequency table from the following data:
| Marks | No. of students |
| less than 10 | 6 |
| less than 20 | 15 |
| less than 30 | 30 |
| less than 40 | 39 |
| less than 50 | 53 |
| less than 60 | 70 |
Solution
The frequency table is
| Marks | No. of students | C. I | f |
| less than 10 | 6 | 0 - 10 | 6 |
| less than 20 | 15 | 10 - 20 | 9 |
| less than 30 | 30 | 20 - 30 | 15 |
| less than 40 | 39 | 30 - 40 | 9 |
| less than 50 | 53 | 40 - 50 | 14 |
| less than 60 | 70 | 50 - 60 | 17 |
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