B  8.1 - 11.0
D  14.1 - 17.0
E  17.1 - 20.0
F  20.1 - 23.0
G  23.1 - 26.0
C  11.1 - 14.0
A  < 8.1
H  26.1 - 29.0
I  > 29.0