1st test 

   192 students took test 1 

    39 made 40 or below 

   153 scored above 40 

       for those 153 the average was 67.0 

2nd test 

   170 students took test 2 

    23 made 30 or below 

   147 scored above 30 

       for those 147 the average was 55.0 

3rd test 

   136 students took test 3 

    32 made 30 or below 

   104 scored above 30 

       for those 104 the average was 52.1 

4th test 

   122 students took test 4 

    23 made 30 or below 

    99 scored above 30 

       for those  99 the average was 58.4 

5th test 

   114 students took test 5 

    11 made 30 or below 

   103 scored above 30 

       for those 103 the average was 64.3 

Overall averages

   117 students took 4 or more tests 

      for these 117 the test average is 60.9  (50 points possible) 
                the final HW average is  8.2  (10 points possible) 

                        quiz average is  8.4  (20 points possible) 
               adjusted quiz average is  8.8  (20 points possible) 

(Due to the disparity between the quiz averages for the Hill
sections (9.1) and the Cohen (7.7) and Adams (7.9) sections,
an adjustment was made for the quiz averages, adding 1.4
and 1.2 points to the Cohen and Adams sections respectively,
with the caveat that no average could be over 10.  In this
way, no one's score was lowered and the quiz averages for
different TA's were made nearly uniform.)

      the average total points (out of 80 possible) is 56.3 

Final exam

   116 students took the final exam

      for these 116 the average is  9.9  (out of 20)

Total class average

    for the 117 students who took 4 or more tests

                     the final overall average is 66.2 points

Here is the grade distribution for those 117 students:

The estimated grade scale, before the exam, based on a middle C of
64.3 points, was

                  D   45-57 
                  C   57-71 
                  B   71-83 
Though this had not included an adjustment for the quiz disparity,
we felt that raising this scale would be unfair.  As a result
the final letter grades were determined by the following scale:

                  D   44-56
                  C   56-70.5
                  B   70.5-81  

with below 44 an E and above 81 an A.  This scale was selected
so as to find gaps in the grade distribution.  With the scale
as above the highest E is 42.0, the lowest D is 44.8, the
highest D is 54.9, the lowest C is 56.0, the highest C is 70.1,
the lowest B is 70.8, the highest B is 79.9, and the lowest
A is 81.2.  So there is at least a 0.7 gap between each grade
level.  Letter grades are assigned strictly based on this scale.