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Figure 3.8: Graph incorrectly labeled
The $x$ axis should be $P(x)$:
The vertical axis is the $x$ axis (since $f(P(x)) = x$), which is why it goes from 0 to 2. And, the horizontal axis is the resulting CDF or $P(x)$ and goes from 0 to 1 (or 0-100% probability).
If that helps, here's fixed image that can be used as replacement:
This intersects with #1531.