Here is histogram of the averages after 11 labs taking
2 drops with an adjustment added section-by-section which
takes into account the varying grading practices of the
TAs and how many times each section was taught by each TA.  
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 88.79

Here is the actual column of adjusted final grades.