







The following table shows the grades of students who supplied the instructor with 3, 4, or 5digit identification numbers for the purpose of posting grades anonymously.
The records are listed in alphabetical order by identification number. If some students declined to supply I.D. numbers, the mean, median, and averagedeviation values reflect the grades of all students, not just those whose grades are shown. The mean grade for each assignment is computed by converting the letter grades to numbers according to the following scale, averaging the numbers, and converting the resulting numbers back to letter grades according to the following scale:
The averagedeviation figure is in lettergrade increments. For example, an average deviation of 1.0 means that on average, individual students’ grades were exactly a letter grade above or below the mean grade. Average deviation is essentially a measure of how widely distributed students’ grades are, as opposed to being clustered together at the mean.
I.D. no.  quiz no. 1  quiz no. 2  quiz no. 3  quiz no. 4  quiz no. 5  class part.  reaction paper no. 1  reaction paper no. 2  reaction paper no. 3  analysis paper no. 1  analysis paper no. 2  analysis paper no. 3  final exam  average 
4%  4%  4%  4%  4%  4%  6%  6%  6%  10%  14%  18%  16%  100%  
1877  B–  D–  F  D–  B  B–  B–  C–/D+  B  F  C–  C  C–  C– 
20556  B+  D  A+  B–  C–  A–  A–/B+  B–  A+  A–  A–/B+  A–/B+  A–  B+ 
2129  A  A  A+  F  F  D  A–/B+  F  F  B–  F  F  F  F 
2303  B  D  B–  B–  B–  B  A–  A–/B+  A  B  A–/B+  B–/C+  B  B 
2628  C  B  C–/D+  C  D+  B  B  A  A–  B  B  C+  C+  B– 
2630  A  A  A–  A  A+  A  B+  A  C+  B–  A–/B+  B  C+  B+ 
28108  B  B  B+  B  C+  B+  B  B–/C+  B+  B–  A–  A–/B+  B  B+ 
2880  A–  F+  F  F  F  F  C  F  F  C–/D+  F  F  F  F 
3233  F  F  A+  F  F  F+  A–  A–/B+  F  F  F  F  F  F 
555  A  B–  D–/F+  A–/B+  B  B–  A  A–  A  B–/C+  B+  B  B–/C+  B 
7928  A  F  C  D+  D+  B  B  B+  B+  B–/C+  C–/D+  C+  B+  C+ 
7947  D  F  F  F  F+  C  B  A–/B+  B  B–/C+  C  D+  F+  D+ 
8269  A  C+  A–  B+  C–  B  B  A  A–  B+  B  A–/B+  A–  B+ 
9483  A–  A  A+  A+  A  B+  A–/B+  C–/D+  A–  B–  B+  B+  B+  B+ 
mean  B  C–  C+  C  C–  B–  B+  B+  A–  B–  B  B–  B–  C+ 
median  A–  C–  B  C+  C–  B  B+  A–  A–  B–  B+  B  B  B– 
avg. dev.  0.9  1.4  1.5  1.4  1.2  1.0  0.4  0.7  0.3  0.6  0.6  0.6  0.8  0.9 