quiz grades for groupB                          avg
1283-274 10 15  8  8                            11.00
2525-544 12 15  7  7                            11.33
1760-564 14  0  0  0                             4.67
0083-013  0  0  0  0                             0.00
9690-957  9  8  7  0                             8.00
2901-564 25 18 17 19                            20.67
8777-050  0 20 18  5                            14.33
4444-728  6  0  0  0                             2.00
7939-990  6  0  0  0                             2.00
0989-208 20 25 19 18                            21.33
4107-047 17 18  8  4                            14.33
5742-264  8 20 12 14                            15.33
3557-706 23 23 16 20                            22.00
4016-212 25 21 25 23                            24.33
7065-872 11  7  8  5                             8.67
8642-232  8  9  8  9                             8.67
2771-554 21 20 15  0                            18.67
4024-351 14 23 12 14                            17.00
the average was computed with  1 drop