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<p>Gibby, I would not draw conclusions based on those statistics. The number of students that took AP Physics C was ~15,000-20,000, while well over 130,000 students took AP Biology. AP Physics C is usually regarded as the most prestigious/difficult science AP, and so only attracts the best students.</p>
<p>As an example, at my school, the AP Physics C class this year consisted of 15 students. There are three AP Biology sections, with a total enrollment of almost 80 students. Next year, there will be ~20 students in physics and over a hundred in biology.</p>
<p>The point being that the higher average on AP Physics C is due to the fact that only the best students take it, as opposed to AP Biology (this is also the reason why AP ESci has the lowest scores of any AP class, despite being commonly regarded as one of the easiest APs).</p>