quiz grades for groupC                          avg
4544-783 25 20 16 16                            20.33
7756-134 25 25 19 19                            23.00
7621-378 25 15  6 14                            18.00
2930-627  8  0  0  0                             2.67
7186-265 21 19  0  7                            15.67
9737-675 22 25  8 10                            19.00
3243-640 23 19 12 15                            19.00
9883-857 24 22 11  2                            19.00
0552-150 20 19 23 18                            20.67
3691-696 17 17  0  0                            11.33
1204-446 10 18  2  2                            10.00
5547-812 16 13  2  5                            11.33
0837-955 18 25 23 25                            24.33
0678-138 20 25 15 15                            20.00
6459-757 25 16  5  8                            16.33
2474-393 25 22 16 23                            23.33
4975-913  0  9  0  0                             3.00
9170-010  0  9  0  0                             3.00
8304-260 25 25  0  6                            18.67
9778-778 15 17 13  1                            15.00
5606-223 10  5  4  1                             6.33
9734-461 25 21 17  6                            21.00
0978-235 10 13  3  2                             8.67
6558-190  5  3  2  1                             3.33
the average was computed with  1 drop