quiz grades for groupA                          avg
9751-847  7 19 18  8                            15.00
6589-319 22 22 15  4                            19.67
9312-728 25 18 18  0                            20.33
6219-889 22 25 20 16                            22.33
9109-411 10 13 20 21                            18.00
8333-425 19 20 18  7                            19.00
7308-480 16 25 18 13                            19.67
8553-559 20 10 14  6                            14.67
7420-558 23 21 18 14                            20.67
8009-461 25 25 23 24                            24.67
7953-038 25  0  0  0                             8.33
5556-626 20 12 10 16                            16.00
3586-009 16 18 16 10                            16.67
5905-472 25 25 18 12                            22.67
6770-874 24  0 24 19                            22.33
5004-158 25 25 21 24                            24.67
7075-724 25 24 19  3                            22.67
2562-947 25 24 21 23                            24.00
the average was computed with  1 drop