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Grades for Physics 151 Lab Summer Term 2, section 401:
Quizzes
 T-Quiz
Labs
 T-lab Tot Ltr
Num
1
2
3
 4 5 6 7 8 9 10
 11
 e.c. (%) 1 2 3 4
5
6
7
8
9
10
 11 (%) (%)
2
 8
 16
 14
 15
 20
 14
 20
 12
 9
 14
 9
 4
 73.1
 94
 74
 84
 79
 74
 86
 76
 74
 85
 86
 -
 81.2
 78.0
 B
4
 7
 17
 20
 11
 20
 8
 17
 20
 18
 8
 20
 6
 81.1
 84
 94
 85
 89
 85
 91
 89
 84
 83
 100
 -
 88.4
 85.5
 A
5
 6
 18
 16
 11
 12
 10
 7
 12
 11
 13
 20
64.6
 85
 90
 93
 77
 78
 91
 75
 70
 86
 92
 -
 83.7
 76.1
 B
6
 12
 18
 18
 20
 20
 8
 9
 18
 16
 10
 16
 6
 80.7
 99
 84
 92
 84
 85
 89
 96
 89
 87
 96
 -
 90.1
 86.3
 A
7
 10
 20
 16
 20
 20
 17
 20
 20
 18
 20
 16
 6
 95.8
 101
 102
 101
 99
 100
 100
 96
 99
 98
 100
 -
 99.6
 98.1
 A
9
 10
 19
 18
 14
 20
 15
 20
 18
 18
 15
 16
 5
 88.7
 95
 98
 92
 96
 98
 94
 97
 96
 92
 90
 -
 94.8
 92.4
 A
11
 10
 11
 16
 12
 6
 20
 12
 20
 16
 12
 20
 6
 75.9
 96
 98
 81
 89
 92
 98
 85
 88
 87
 88
 -
 90.2
 84.5
 A
13
 6
 16
 20
 19
 18
 16
 11
 18
 18
 3
 16
 2
 76.9
 97
 93
 83
 85
 86
 97
 91
 92
 88
 88
 -
 90.0
 84.8
 A
15
 10
 15
 8
 12
 4
 9
 3
 10
 12
 4
 5
43.4
 86
 77
 81
 95
 66
 70
 68
 83
 83
 82
 -
 79.1
 64.8
 C
16
 5
 13
 9
 2
 4
 7
 3
 2
 3
 2
 7
26.9
 71
 0
 72
 57
 62
 68
 0
 0
 69
 78
 -
 47.7
 39.4
 F*
17
 12
 14
 15
 18
 15
 16
 19
 14
 14
 16
 16
79.7
 93
 82
 91
 92
 74
 88
 84
 85
 81
 88
 -
 85.8
 83.4
 A
18
 6
 18
 17
 12
 10
 13
 11
 3
 13
 8
 11
57.6
 92
 78
 86
 87
 84
 97
 73
 69
 80
 78
 -
 82.4
 72.5
 B
19
 7
 11
 14
 15
 6
 9
 10
 14
 11
 11
 2
 4
 53.8
 79
 85
 76
 74
 82
 90
 79
 86
 83
 80
 -
 81.4
 70.3
 B












































































































































ave
8
15
15
14
13
12
12
14
14
10
13

69.1
83
81
79
78
76
82
78
79
79
82

84.2
78.2


The class curve was a little strange this semester. So many students were clustered within 1 percent of each other at the 83 - 86 mark that it was impossible to cut the curve between them. It isn't fair to give an 86.3 and A while an 85.5 (less than 1 percent difference) is a B. So I had a choice: either I give 7 A's or 2 A's. Neither choice is a good choice, since my target number is 25% of the class should get A's. Looking at the lab scores (a good indication of the amount of work done by a student) and the extra credit, I decided that the 83 - 86 % group had worked very hard this summer. Ordinarily I do not give this many A's, and I almost never consider an 83% an "A" grade. But as you learned in the darts lab, a low number of trials (in this case, students) can lead to a badly shaped Gaussian! So here's your very strange curve: Average total score: 78.2% (the lab average is supposed to be a "B").
81-100% A (7 of 13 students, 53.8% of the class)
68-81% B (4 of 13 students, 30.8% of the class)
below 68% C(1 of 13 students, 7.7% of the class)
*failure to complete labs F (1 of 13 students, 7.7% of the class)