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प्रश्न
Find the mean of the following distribution:
| x : | 10 | 12 | 20 | 25 | 35 |
| F : | 3 | 10 | 15 | 7 | 5 |
उत्तर
| x | f | fx |
| 10 | 3 | 30 |
| 12 | 10 | 120 |
| 20 | 15 | 300 |
| 25 | 7 | 175 |
| 35 | 5 | 175 |
| N = 40 | `sumfx = 800` |
`∴ Mean (barx) = (sumfx)/N`
= `800/40 = 20`
x = 20
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