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Question
Write the median class for the following frequency distribution:
| Class-interval: | 0−10 | 10−20 | 20−30 | 30−40 | 40−50 | 50−60 | 60−70 | 70−80 |
| Frequency: | 5 | 8 | 7 | 12 | 28 | 20 | 10 | 10 |
Solution
We are given the following table.
| Class Interval | Frequency | Cumulative Frequency |
| 0−10 | 5 | 5 |
| 10−20 | 8 | 13 |
| 20−30 | 7 | 20 |
| 30−40 | 12 | 32 |
| 40−50 | 28 | 60 |
| 50−60 | 20 | 80 |
| 60−70 | 10 | 90 |
| 70−80 | 10 | 100 |
| N = 100 |
Here, N = 100
The cumulative frequency just greater than 50 is 60.
So, the median class is 40−50.
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