quiz grades for groupC                          avg
9797-276 17 22 23 12                            20.67
1035-722  3  9 11  4                             8.00
4244-426 12 23  7  4                            14.00
7707-160  1 22 11 12                            15.00
3319-001  0  5  0  0                             1.67
9140-287  2 14  0  0                             5.33
6819-222 25 20 25 13                            23.33
8357-452 21 23 17  2                            20.33
7181-818 25 25 15  2                            21.67
5711-785 19 23 18 18                            20.00
9693-350  3  8  8  7                             7.67
3782-397 22 17  9  5                            16.00
4267-604 25 23 18 16                            22.00
9173-700  2  8  0  0                             3.33
5681-261  8 15  9  0                            10.67
4066-978  0 16  0  0                             5.33
4043-723  0  6  0  0                             2.00
3766-113 24 25  0  1                            16.67
the average was computed with  1 drop