Actually, it's on the low end of "normal" intelligence. Rock bottom of that category, actually.
70-84 is borderline, and once you get to 69 and below you've officially hit mild mental retardation. It's standard deviations of 15.
Anyway, looked up more on the chart, and it turns out that it's more so a measure of average income than IQ, with the basis for the correlation being the book, "IQ and the Wealth of Nations." Meaning that while the book was not directly involved in the chart, the methodology came directly from it.
http://www.isteve.com/Web_Exclusives_Ar ... ay2004.htm
He also made his own chart, found here
. Funny thing to me is that it lists D.C. pretty far down on the list.
Edit: Global average IQ is definitely not 100 unless specifically adjusted for each region, in which case the UK would also have an average of 100.
IQ tests are designed to achieve an average of 100 and a 15 point standard deviation. When you have someone from, say, Italy, take an American-made IQ test, they will more than likely score lower than 100 simply because it doesn't fit their culture. Even translated perfectly into Italian, just wording something a different way can affect people's ability to answer the question. And that's not just making the wording simpler, but different grammatical structures are actually easier to understand to some cultures than others.
So the only way an IQ test could be accurate is if it's specifically tailored to the group taking it. And if you did that, since an IQ test is essentially an aptitude test and people in third world countries don't have the same education opportunities, an IQ of 130 in Ethiopia means something very different than an IQ of 130 in America.
For another look at that fault, the movie, Idiocracy, had someone who was abnormally normal in 2005 (Scoring the median in every possible test) become the smartest man in the world when he was woken up in 2505, scoring higher than anyone else on the IQ test.