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प्रश्न
find the mean for the following frequency distribution:
| C.I | 0-50 | 50-100 | 100-150 | 150-200 | 200-250 | 250-300 |
| Freq | 4 | 8 | 16 | 13 | 6 | 3 |
बेरीज
उत्तर
| Class interval | Frequency (f) | Cclass mark(x) | fx |
| 0-50 | 4 | 25 | 100 |
| 50-100 | 8 | 75 | 600 |
| 100-150 | 16 | 125 | 2000 |
| 150-200 | 13 | 175 | 2275 |
| 200-250 | 6 | 225 | 1350 |
| 250-300 | 3 | 275 | 825 |
| Total | 50 | 7150 |
Mean= `(∑fx)/(∑ f) =7150/50=143`
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