Let G = hw1+hw2+hw3+hw4+ex1+ex2
    G in [0,590]
(VoP is not used but counts positively : the ranges would be
fixed even if G=G+VOP is used below.)


A       range :   G in [480,590]
B or B+ range :   G in [380,480]
C or C+ range :   G in [280,380]
D       range :   G in [240,280]
F       range :   G in [  0,240]
    Ranges overlap.

    Class average is ~414 with standard deviation 96
    Class median  is  427
    (for defs see statistics file.)

Nov 10@22:10