quiz grades for groupB                          avg
0894-109  3  2  2  0                             2.33
1481-093  9  0 10  8                             9.00
4909-144  6 13 14  0                            11.00
5897-617 25 18 22 20                            22.33
5401-047  3 11  2  0                             5.33
4590-542  4  0 10 10                             8.00
3768-138  4 12  9 10                            10.33
3091-014 10  8  6  7                             8.33
6227-405 15 15  0  8                            12.67
5154-791  4 13 10  6                             9.67
0599-046  7  0  0  0                             2.33
4907-969  3 13  5  2                             7.00
7912-476 17 25 18  8                            20.00
8171-283  0  0  0  0                             0.00
2351-990  3 10  8  4                             7.33
0953-218 12 16 16  2                            14.67
7507-209  7 15  0  0                             7.33
7026-089  4  9  2  2                             5.00
2407-440  9 15 17  8                            13.67
1558-929 15 15 12  4                            14.00
4539-695 13 23 22 18                            21.00
4818-908  2  5  7  0                             4.67
the average was computed with  1 drop