quiz grades for groupA                          avg
8971-513 25 23  9 25                            24.33
1409-458 19 23 17 25                            22.33
2859-822 25 25 23 24                            24.67
3681-440 22 18 15 25                            21.67
3141-477 25 25 14 24                            24.67
0897-909  2  0  0  0                             0.67
7396-494 10 23  4 13                            15.33
8612-970 15  0  0  0                             5.00
8388-585  7  0  0  0                             2.33
9279-140  0  0  0  0                             0.00
9637-974 23 21 15 18                            20.67
3620-878 10 18  9 23                            17.00
8496-126 20  0  0  0                             6.67
4174-227 25 23 20 15                            22.67
9446-003 23 20  0  0                            14.33
7926-296 18  0  0  0                             6.00
5872-627 25 25 19 21                            23.67
1128-639 13 21 11 24                            19.33
0907-005 24 17 23 22                            23.00
2494-910 24 23 25 25                            24.67
1534-443 24 23 23 23                            23.33
the average was computed with  1 drop