Mathematics
If the mean of the data given in adjoining table is 20, the relation between x1 and x2 is :
| x | f | fx |
|---|---|---|
| 10 | x1 | |
| 20 | 20 | |
| 30 | x2 |
x1 + x2 = 30
x1 - x2 = 15
x1 - x2 = 0
x1 + x2 = 20
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