The bottom quintile
(media.scored.co)
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That's not how IQ works, unless you're talking about people who haven't even developed the verbal skills to be effectively tested for IQ, in which case it's an irrelevant distinction that has nothing to do with why different groups might have different IQ distributions.
I think we've just found out which quintile Gizortnik is in
Yes it does. Your IQ changes over-time. There has never been a baby with a 100 IQ, and there never will be. Your IQ declines after 40.