quiz grades for groupA                          avg
1853-841 25  0  0  0                             8.33
6558-955 25 18 24 20                            23.00
1226-472 10  0  0  4                             4.67
6689-094 24  0 21 17                            20.67
7176-041  8  0 16  5                             9.67
6119-294 24  2 18  0                            14.67
0008-488 25 22 22 18                            23.00
4891-505  6  0 11  0                             5.67
4606-722 18 17 15 16                            17.00
7757-851 23  0  0  0                             7.67
3315-339  6 16  4  2                             8.67
6961-689 22 17  0  0                            13.00
0517-834 25 25 22 25                            25.00
5492-899 15  0 12  0                             9.00
5018-170 16  0  0  0                             5.33
0618-369 23 24 23 15                            23.33
4767-153 12 14 10 10                            12.00
5837-392 25 11 21 17                            21.00
6772-422 11  2 12  0                             8.33
8308-321 11 16  0  0                             9.00
3455-718 25  0 15 20                            20.00
the average was computed with  1 drop