ICSE Class X Math 2015 Solved Paper
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Question : 28
Total: 52
Calculate the mean of the following distribution:
| Class Interval | Frequency |
|---|---|
| 0-10 | 8 |
| 10-20 | 5 |
| 20-30 | 12 |
| 30-40 | 35 |
| 40-50 | 24 |
| 50-60 | 16 |
Solution:
| Class | Mid value (x) | f | fx |
|---|---|---|---|
| 0-10 | 5 | 8 | 40 |
| 10-20 | 15 | 5 | 75 |
| 20-30 | 25 | 12 | 300 |
| 30-40 | 35 | 35 | 1225 |
| 40-50 | 45 | 24 | 1080 |
| 50-60 | 55 | 16 | 880 |
| Σf=100 | Σfx=3600 |
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