1. Exam solution and grading

2. My scoring and my cutoffs

As usual, my scoring is harsh but my cutoffs are lenient.

Problem 2 (GeekOS) didn't work out. I wanted two things: (1) metrics for identifying candidates to freeze/unfreeze; and (2) a decision procedure that used these metrics to decide which process (if any) to freeze/unfreeze. I should have asked for part 1 only, and I should have stated it in these words. So I ended up treating this problem as extra credit.

Here are cutoffs and how I chose them:

P1   P2  P3  P4  Total
19   0   20   6   45    A ≥ 45
19   0   15   5   39    B ≥ 39
15   0   12   3   30    C ≥ 30
10   0   10   0   20    D ≥ 20

3. Total scores and individual problem scores

The columns below are independent. Column 1 has the sorted scores for problem 1, column 2 has the sorted scores for problem 2, etc. The last column has the sorted total scores and cutoffs.

P1(20)	P2(20)	P3(20)	P4(10)	Total(70)
19	15	20	10	63
19	14	20	10	59
18	12	20	10	58
18	12	20	10	58
18	12	20	10	54
18	11	20	10	53
18	10	20	9	52
18	10	19	9	49
18	10	19	5	47
18	8	19	5	46
18	8	15	5	46
18	8	15	5	45
18	8	15	5	45  A ≥ 45
17	7	15	5	44
17	6	15	5	43
17	6	15	5	43
17	6	15	4	42
17	6	13	4	41
17	6	12	4	41
17	6	12	3	40
17	6	10	3	39  B ≥ 39
16	6	10	3	38
16	6	10	3	37
16	6	8	3	37
16	6	7	3	36
16	6	7	3	34
16	6	6	3	33
16	6	5	2	31
15	6	4	2	30  C ≥ 30
15	5	4	1	28
14	5	4	1	26
12	4	4	0	20
7	2	2	0	20  D ≥ 20