I've finished grading the final and the results are summarized below.
You can stop by my office when I'm in if you want to pick yours up (I
won't leave them outside my office because of the risk of them getting
lost).  I am still working on the grades for the whole course.

Guy

Highest score: 96 (two of them)
Average score: 80
Median score: 82

Distribution

                      *
                      *
                      *
                      *
                      *
                   *  *  *  *
                   *  *  *  *  *
          *  *  *  *  *  *  *  *
    *     *  *  *  *  *  *  *  *
   50 55 60 65 70 75 80 85 90 95
   (80, e.g., corresponds to interval 80-84)

Approximate Grades:

60-74: C
75-84: B
85-100: A

Also text in the square brackets below should be added to the solution
to problem 2A I had previously sent out.

2 (A) The set of columns corresponding to a cycle are not linearly
    independent since they will sum to a zero vector [if directed in same
    direction by negating columns when flipping edges].  This means that any
    square matrix that includes them will not be invertible.
    The basis variables for simplex must correspond to an 
    invertible set of columns.