Physics 241W Workshop

Fall 2008

Course Coordinator:  Rick Marshall

How To Calculate Your Final Grade

Algorithm
First, look on WebAssign to get your raw Homework (H), Lab (L), and Quiz (Q) scores.
Second, use Table 1 (below) to find your TA’s average assigned lab score (LTA) and the associated standard deviation (σTA) as well as the overall statistics (LOA and σOA ).
Third, calculate your curved lab score as follows: LC = (L-LTA )×σOA /σTA  + LOA.
Fourth, calculate your final score: S = 0.2×H + 0.5×LC + 0.3×Q
Finally, look up your letter grade in Table 2 (below).

Example
The student’s scores (from WebAssign):
H: 93.22%
L: 82.51%
Q: 72.73%

Their TA’s statistics:
LTA : 85.51%
σTA : 9.05%

Overall statistics:
LOA: 92.23%
σOA : 5.89%

The curved Lab score is then: LC = (82.51% - 85.51%) × 5.89%/9.05% + 92.23% = 90.28%

The final score is then: S = 0.2×93.22% + 0.5×90.28% + 0.3×72.73% = 85.60%, which maps to a letter grade of B.

Table 1

TA

Mean L

StDev σ

Tom Anuniwat

88.11%

8.08%

Baile Chen

95.02%

4.39%

Manli Ding

93.40%

3.79%

Qiujun Huang

89.23%

5.99%

Jooseop Lee

91.92%

6.87%

Feng Lin

92.15%

3.39%

Peng Peng

91.95%

5.88%

Diancheng Wang

94.10%

6.06%

Chengping Wu

90.89%

4.38%

Wei Xiao

93.56%

4.13%

Chunhu Zhang

91.61%

6.90%

Yuan Zheng

92.10%

6.78%

Overall

92.23%

5.89%


Final Score Histogram

 

 

Table 2

Grade

Minimum
Score

Corresponding
Percentile

A+

94.5%

95.0

A 

92.5%

83.0

A-

90.4%

65.0

B+

87.4%

40.0

B 

84.9%

24.4

B-

81.5%

12.3

C+

78.7%

5.0

C 

75.0%

2.7

C-

69.0%

1.0

D+

60.0%

0.6

D 

50.0%

 


Final Grade Histogram