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  1. World ranking of countries by their average IQ

What is the average IQ in Democratic Republic of the Congo?

Avg. IQ: 78
World ranking: #29

To discover the global ranking, click here.

These numbers relative to the average IQ byCountryCode.cd came from a work carried out from 2002 to 2006 by Richard Lynn, a British Professor of Psychology, and Tatu Vanhanen, a Finnish Professor of Political Science, who conducted IQ studies in more than 80 countries.

Richard and Tatu argues that differences in national income are correlated with differences in the average national intelligence quotient (IQ). They further argue that differences in average national IQs constitute one important factor, but not the only one, contributing to differences in national wealth and rates of economic growth.

These results are controversial and have caused much debate, they must be interpreted with extreme caution.

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A world map ranking countries by their average IQ
Average national IQs according to IQ and Global Inequality (2002)