Question
Why AFC curve is a rectangular hyperbola?
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| X | Frequency (f) |
| 5 | 5 |
| 10 | 7 |
| 15 | ? |
| 20 | 10 |
| 25 | 8 |
| 30 | 6 |
| $\Sigma f=50$ |
| Good X(units) | Good Y(units) |
| 0 | 20 |
| 1 | 18 |
| 2 | 14 |
| 3 | 8 |
| 4 | 0 |