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Question
The marks scored by 20 students in a test are given below:
54, 42, 68, 56, 62, 71, 78, 51, 72, 53, 44, 58, 47, 64, 41, 57, 89, 53, 84, 57.
Complete the following frequency table:
| (Marks in class intervals) | Tally marks | Frequency (no. of children) |
| 40 - 50 | ||
| 50 - 60 | ||
| 60 - 70 | ||
| 70 - 80 | ||
| 80 - 90 |
What is the class interval in which the greatest frequency occurs?
Solution
The frequency table can be completed as follows:
| Marks in class intervals | Tally Marks | Frequency |
| 40 - 50
|
|||| | 4 |
| 50 - 60 | `cancel(bb|bb|bb|bb|)|||` | 8 |
| 60 - 70 | ||| | 3 |
| 70 - 80 | ||| | 3 |
| 80 - 90 | || | 2 |
The class interval with the greatest frequency (8) is 50 - 60.
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