Disclaimer: not defending anything but math.
I don't know where OP got his numbers, but they don't seem far off.
http://www.lsac.org/lsacresources/resea ... -10-03.pdf Page 20
Number of test takers and mean and standard deviation (SD)
of LSAT scores by race/ethnicity, 2009–2010
Race/Ethnicity 2009–2010
Black/African American
N 14,585
Mean 142.04
SD 8.74
White/Caucasian
N 79,799
Mean 152.86
SD 9.33
By this, it suggests that ~10 AAs will achieve a score of 170+ (.07%)
and 2,642 caucasians will do the same (3.31%, or 47 times as likely)
I honestly find it hard to wrap my head around that.