prs grades<>quiz grades<>HW grades<>overall grades
    ID     T1  T2  T3  T4  average points  exam
7109-633  54  48  46   6  49.333  23.680    14
8448-228  81  34  53  29  56.000  26.880    15
1269-825 125  80 104  92 107.000  51.360    37
9487-032  87  70  61  77  78.000  37.440    23
9244-278 111  68  75  65  84.667  40.640    18
8321-641  50  60  59  60  59.667  28.640    20
1081-750 111  76  67  58  84.667  40.640    23
7187-805 108 110 105  96 107.667  51.680    33
2955-490  78  77  59  78  77.667  37.280    19
7512-566 113  86  81  71  93.333  44.800    27
0560-294  36  55   0  42  44.333  21.280    16
8837-361  74  72  64  41  70.000  33.600    20
 average is out of 125; points are out of 60
 exam score is number correct out of 40