Here is histogram of the averages after 12 labs taking
2 drops with an adjustment added section-by-section which 
takes into account the varying grading practices of the 
TAs.  The solid lines indicate the approximate A, B, and 
C cutoffs, and the dotted lines indicate the approximate 
cutoffs between + and - grades.

The class average (the average of all final averages)
for the year is 83.82

Here is the actual column of adjusted final grades.