Physics 142W Workshop

Sring 2007

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: 87.63%
σOA : 9.25%

The curved Lab score is then: LC = (82.51% - 85.51%) × 9.25%/9.05% + 87.63% = 84.56%

The final score is then: S = 0.2×93.22% + 0.5×84.56% + 0.3×72.73% = 82.74%, which maps to a letter grade of B.

Table 1

TA

Mean
L

StDev
σ

Pete Alonzi

86.15%

10.21%

Kelsie Betsch

81.77%

11.89%

Wei Jiang

88.52%

5.90%

Kunal Kathuria

93.06%

2.23%

Emmanuel Muyangabe

92.56%

6.51%

Jinsub Paeng

89.33%

8.43%

Yonghang Pei

88.36%

10.96%

Kosta Popović

82.69%

8.03%

Juan Yu

85.95%

6.87%

Overall

87.63%

9.25%


Final Score Histogram

 

 

Table 2

Grade

Minimum
Score

Corresponding
Percentile

A+

94.2%

95

A 

91.7%

82

A-

89.6%

64

B+

86.2%

42

B 

83.1%

24

B-

80.3%

12

C+

77.7%

7

C 

74.0%

3

C-

71.0%

2

D+

64.0%

1

D 

50.0%

 

D- 

40.0%

 


Final Grade Histogram