quiz grades for groupA                          avg
4740-916  3  0  5  0                             2.67
5212-029  7 17 16  2                            13.33
3983-563  0 24  0 11                            11.67
1656-538 24 25 22  0                            23.67
4187-013  0 14  3  2                             6.33
0628-472  2 18 12 10                            13.33
7623-476 20 23 20 20                            21.00
9340-953 15 18  0  0                            11.00
5788-449  3  9  9 12                            10.00
5637-470  1  2  0  0                             1.00
9811-093  3 19 13  2                            11.67
9945-628  7 10  7  7                             8.00
8652-052  4 14 11 13                            12.67
5413-682 25 17  7  6                            16.33
1456-281 25 25 17 15                            22.33
2433-637 13 23 16 23                            20.67
3006-321 25 25  8 12                            20.67
0951-634  2 15 11  4                            10.00
the average was computed with  1 drop