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प्रश्न
Find the mean of the following frequency distribution :
| Class | 50-60 | 60-70 | 70-80 | 80-90 | 90-100 |
| Frequency | 8 | 6 | 12 | 11 | 13 |
बेरीज
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उत्तर
| Class Interval | Xi | fi | fiXi |
| 50-60 | 55 | 8 | 440 |
| 60-70 | 65 | 6 | 390 |
| 70-80 | 75 | 12 | 900 |
| 80-90 | 85 | 11 | 935 |
| 90-100 | 95 | 13 | 1235 |
| Total | 50 | 3900 |
`barx = (Σf_iX_i)/(Σ"f")`
`barx = 3900/50`
`barx = 78`
`therefore` Mean = 78
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