<p>I got a C+ for some STATS class. I did not appeal the grade because I thought that I did really bad in final exam. But when I talked to my friend who took the same class with me, I realized that I probably did not. So can I appeal my final grade now to know whether it is a computatiom error?</p>
<p>Yes, as long as within 2 years. Send a nice short 4~5 sentence e-mail to the professor and make an appointment to see if you can view the final exam and also check if the final grade was computed correctly.
Of course, explain what you wrote above in the e-mail.</p>