why would someone downvote this? I'm simply pointing out facts. For example, see this paper by Wicherts et al [1]: "Our estimate of average IQ converges with the finding that national IQs of sub-Saharan African countries as predicted from several international studies of student achievement are around 82."

[1]http://wicherts.socsci.uva.nl/wicherts2010IQAFR.pdf