APFIVE Invasive Species Establishment Probability
The probability that an invasive species establishes at a distance $$x$$ km from its introduction point is modeled by $$D(x)=\frac{1}{1+e^{-0.8*(x-50)}}$$. Based on the table, what is the value of $$D(x)$$ at $$x=50$$ km?
| Distance (km) | D(x) |
|---|---|
| 40 | 0.18 |
| 50 | 0.50 |
| 60 | 0.82 |
A
$$0.5$$
B
$$0.2$$
C
$$1.0$$
D
$$0.8$$
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