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Question
The marks obtained (out of 20) by 30 students of a class in a test are as follows:
14, 16, 15, 11, 15, 14, 13, 16, 8, 10, 7, 11, 18, 15, 14, 19, 20, 7, 10, 13, 12, 14, 15, 13, 16, 17, 14, 11, 10, 20.
Prepare a frequency distribution table for the above data using class intervals of equal width in which one class interval is 4 – 8 (excluding 8 and including 4).
Solution
| Class interval | Tally marks | Frequency |
| 4 – 8 | `bb|bb|` | 2 |
| 8 – 12 | `\cancel(bb|bb|bb|bb|) bb|bb|` | 7 |
| 12 – 16 | `\cancel(bb|bb|bb|bb|) \cancel(bb|bb|bb|bb|) bb|bb|bb|` | 13 |
| 16 – 20 | `\cancel(bb|bb|bb|bb|) bb|` | 6 |
| 20 – 24 | `bb|bb|` | 2 |
| Total | 30 |
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