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Exam 1 statistics 
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       (reported on  2/17) 
N              =    57
Interval       =    0..140
Average        =   101
Stand Deviation=    25
Median         =   104
Min range      =   0-50
Max range      =  132-140
=================================

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Exam 2 statistics  aka Midterm
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       (reported on   3/21)
N              =    58
Interval       =    0..333
Average        =    249
Stand Deviation=    42
Median         =    261
Min range      =    0-160 
Max range      =    320-333


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Exam 3 statistics aka Final
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       (reported on   5/16)
N              =    57
Interval       =    0..333
Average        =    169
Stand Deviation=    47
Median         =    168
Min range      =      0..50
Max range      =    290..333

************************************
The class average (with the 20 bonus points) but no excess
points is 686. With excess points it is 715
Under curving students around this threshold 
receive a B or C+. My grading scheme is a bit more generous
thus 686 plus or minus few points (say 20) are expected to
be entirely in the B range.
************************************************************

RULE 1.
Final Exams at 25% of 333  = 83.25 receive an automatic F per 
Syllabus(Handout 1).
If letter grade is assigned here it is final; for all other cases 
it will involve RULE 2 and ADJUSTMENTS 1-3.

RULE 2.
Students are then groupped 'curve like' per half of standard deviation 
(usually 70pts).  Final Letter grades are decided for the remaining 
non-RULE 1 students.

ADJUSTMENT-1
RULE-2 students below 500 are added excess points to determine if they 
can be assigned a C.

ADJUSTMENT-2
RULE-2 students with (< 500 pts) but with  points at least  50% of top 
student's points and a Final   at MORE than 50% of top Final exam grade
also get a C even if they have < 500 pts.

ADJUSTMENT-3
Students at more than 500 points use excess points provided Final Exam
grade is around the level of the Exam 3 grade of students in the upper group.
A violation (or violations) of the Collaboration policy of the course
adjust the final letter grade appropriately.

Definitions     Definitions
===========     ===========
N               =  number of students taking the exam
Interval        =  0 to maxpoints possible for exam (as in Handout 1)
Average         =  Sum of exam grades divided by N
Stand Deviation =  Shows dispersion of grades. Roughly, 2/3 of the grades are
                   within 37 +/- 12 , and 95% within  37 +/-  2*12 if ave is 37 
                   and std 12
Median          =  Half of the students got that much or less 
                   (and half, more than that).