quiz grades for groupB                          avg
1876-374 20  0 11  9  8  8                      12.00
9992-230 12  7 12  0  0  0                       7.75
6421-473 16  0 17 12  5  0                      12.50
7080-195 13  5  6  7  0  0                       7.75
1591-643  0  0 12  0  0  0                       3.00
1472-165  0  9 10  0  0  0                       4.75
5882-934 17 20 15  8 10 16                      17.00
6179-687 18 20 15 12 19 19                      19.00
9201-316 17  7  7  0  0  0                       7.75
3075-177 20 20  9 11 19 14                      18.25
5674-396 18 18 20 15 15 10                      17.75
9854-532 20 18 18 11  0  0                      16.75
3474-430  9  0  0  0  0  0                       2.25
4118-100 18 20 12 20 19  0                      19.25
4470-420 20 20  0  0  0  0                      10.00
1373-773 14  4  9  0  0  0                       6.75
6275-929  8  0  0  0  0  0                       2.00
9491-716  0  3  7 17  6  0                       8.25
1419-232  0  0  0  0  0  0                       0.00
4796-158  0 20 19  8  2 10                      14.25
the average was computed with  2 drops