Grade Standing

Need help figuring out grade/where I stand in the course?

I’m taking organic chemistry and the teacher has only told us that it depends on how everyone else does in the class. So far we have had 4 quizzes and he has told us the average for each quiz
Quiz 1-15.7
Quiz 2-12.4
Quiz 3-11.6
Quiz 4-11.1
So how do I figure out where I fit in? If you add all four averages together I that a C?

It looks like it may be a C provided that each quiz is of equal weight./

PS22 Chorus “I’LL STAND BY YOU” The Pretenders