HW1  HW2  PRP
 average  94   86   97
incl.bl.  87   75   78
  out of  100  100  100
average%  94   86   97
incl.bl.  87   75   78

80%..     84   70   75
70%..79%  1    3    0
60%..69%  0    1    0
50%..59%  1    1    0
   ..49%  0    6    0
  blanks  7    12   18
   total  93   93   93