He&#x27;s suggesting that we should dig up academic papers studying the topic and run the numbers based on the intelligence distributions found therein.<p>Here are a few review articles to get you started - more detailed studies can be found referenced therein.<p><a href="http:&#x2F;&#x2F;psychology.uwo.ca&#x2F;faculty&#x2F;rushtonpdfs&#x2F;PPPL1.pdf" rel="nofollow">http:&#x2F;&#x2F;psychology.uwo.ca&#x2F;faculty&#x2F;rushtonpdfs&#x2F;PPPL1.pdf</a><p><a href="https:&#x2F;&#x2F;home.ubalt.edu&#x2F;tmitch&#x2F;645&#x2F;articles&#x2F;roth%20et%20al%20ethnic%20grp%20diff%20in%20cog%20abil%20ppsych%202001.pdf" rel="nofollow">https:&#x2F;&#x2F;home.ubalt.edu&#x2F;tmitch&#x2F;645&#x2F;articles&#x2F;roth%20et%20al%20...</a><p><a href="http:&#x2F;&#x2F;psychology.uwo.ca&#x2F;faculty&#x2F;rushtonpdfs&#x2F;PPPL1.pdf" rel="nofollow">http:&#x2F;&#x2F;psychology.uwo.ca&#x2F;faculty&#x2F;rushtonpdfs&#x2F;PPPL1.pdf</a><p><a href="http:&#x2F;&#x2F;matt.colorado.edu&#x2F;teaching&#x2F;highcog&#x2F;fall8&#x2F;nbbbbchlpsu96.pdf" rel="nofollow">http:&#x2F;&#x2F;matt.colorado.edu&#x2F;teaching&#x2F;highcog&#x2F;fall8&#x2F;nbbbbchlpsu9...</a><p><a href="https:&#x2F;&#x2F;www.udel.edu&#x2F;educ&#x2F;gottfredson&#x2F;reprints&#x2F;1997mainstream.pdf" rel="nofollow">https:&#x2F;&#x2F;www.udel.edu&#x2F;educ&#x2F;gottfredson&#x2F;reprints&#x2F;1997mainstrea...</a>