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प्रश्न
Calculate the mean for the following distribution:
| x : | 5 | 6 | 7 | 8 | 9 |
| f : | 4 | 8 | 14 | 11 | 3 |
उत्तर
| x | f | fx |
| 5 | 4 | 20 |
| 6 | 8 | 48 |
| 7 | 14 | 98 |
| 8 | 11 | 88 |
| 9 | 3 | 27 |
| N= 40 | `sumfx 281.` |
∴ Mean`bar x = (sumfx)/ N`
= `281 / 40`
= 7.025
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