quiz grades for groupB                          avg
6900-568  0  3  0  0                             1.00
3377-006  6 23 10 11                            14.67
9678-282  0 12  0  0                             4.00
2572-954 25 20  0  0                            15.00
1618-994  2 25  7 12                            14.67
5189-430  4  9  0  0                             4.33
9523-073  0  0  0  0                             0.00
2654-290 22  0  0  0                             7.33
4455-996 21 20 10 16                            19.00
9793-247  0  0  0  0                             0.00
7311-096  0 16 10  2                             9.33
0467-831  5 20  9  5                            11.33
3632-169  9  0  0  0                             3.00
0152-542 11 12  4  2                             9.00
3779-902 15 11 11  0                            12.33
6482-217 18 22  9 18                            19.33
2957-914 18 25 16 25                            22.67
the average was computed with  1 drop