quiz grades for groupA                          avg
0433-147 19 18 15  9                            17.33
0648-093 25 22 16 13                            21.00
1973-944  6 24  0  0                            10.00
9643-722 21 22 12  8                            18.33
7648-737  7 16 15  9                            13.33
7508-778 25  0 23 25                            24.33
8227-709  0  0  0  0                             0.00
9948-321 25 25 21 19                            23.67
7270-423  7  0  0  0                             2.33
8278-987 19 23 14 13                            18.67
3958-261  6 12  6  9                             9.00
2228-782  6 10  0  0                             5.33
3521-685 23 15  5 11                            16.33
3416-234  6  9  0  0                             5.00
8163-904 25 20 11  9                            18.67
0850-958  8  6  0  0                             4.67
5525-003 12 10 14  9                            12.00
1888-164  6  5  0  0                             3.67
6927-882 15 14 18  0                            15.67
3381-780 24 21 13 15                            20.00
6308-112  0  0  6  9                             5.00
the average was computed with  1 drop