<p>Is it appropriate to email my professor if I have a question about project grades that were graded at the end of the semester? I really don't understand why I got some of the grades I did in this one particular class.</p>
<p>Absolutely.</p>
<p>As long as you're polite about it. A good way might be to ask how you did on the final exam if you had one. I've had a couple instances so far where I was unpleasantly surprised by a grade. In both cases it turned out that, despite beating the means on all of the prelims and problem sets, I completely bombed the final.</p>