How to interpret your score on the third quiz
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123 people took the quiz.
Scores ranged from 7 to 20 out of 20 points.
Mean 15.5, median 16.5

Approximate grade breaks

>= 18  A
>= 16  B
>= 13  C
>= 10  D

If you look at the score distribution (e.g. on compass), it was noticably
bimodal:   a hump in the high scores, a hump in the low scores, and a 
dip between them.   So the number of A's and B's is higher than normal.