Not to mention a gap in his grasp of maths and stats (I think I know where that gap might be located.)

He believes that the majority (ie over 50%) of South Africans are black AND working class, AND female

A) Black =  plus minus 80%
B) Female = plus minus 52%
C) Working class = who knows? maybe 50% 

A x B x C = 21%, not 50%!