quiz grades for groupB                          avg
2663-359  2 10  4 15                             9.67
8044-404  1  9  5 10                             8.00
4751-665  1 19  3 11                            11.00
0963-074 18 25 22 25                            24.00
4921-812 15 16 10  0                            13.67
3369-290  6  2  2  0                             3.33
7700-514  0  0 22  4                             8.67
4581-700  0 11  0  0                             3.67
9828-659 25 25 14  4                            21.33
2880-028 22 25  8  0                            18.33
5752-550  3  0  0  0                             1.00
8603-913  0  0  0  0                             0.00
4235-038 25 22 18 10                            21.67
9888-218 25 23 18  2                            22.00
4562-206  2 10  6  2                             6.00
7148-909 25  5  9  0                            13.00
9306-452  2  8  3  2                             4.33
9021-549 22 16  7  4                            15.00
0823-330  8 18  3  5                            10.33
4805-874  4 19  9 16                            14.67
3571-525 12  8  1  0                             7.00
3986-844 20 19 22 20                            20.67
8354-071 25 15  7 20                            20.00
the average was computed with  1 drop