text: The average IQ is by definition 100; scores above 100 indicate a higher than average IQ and scores below 100 indicate a lower that average IQ. Theoretically, scores can range any amount below or above 100, but in practice they do not meaningfully go much below 50 or above 150.\n\nHalf of the population have IQ’s of between 90 and 110, while 25% have higher IQ’s and 25% have lower IQ’s:\n\nDescriptive Classifications of Intelligence Quotients \n  \nIQ                  Description            % of Population \n130+            Very superior                   2.2% \n120-129       Superior                           6.7% \n110-119        High average                 16.1% \n90-109          Average                           50% \n80-89            Low average                   16.1% \n70-79            Borderline                        6.7% \nBelow 70       Extremely low                 2.2% \n\nScore                   Job\n140       Top Civil Servants; Professors and Research Scientists. \n130        Physicians and Surgeons; Lawyers; Engineers (Civil \n                    and Mechanical) \n120         School Teachers; Pharmacists; Accountants; Nurses; \n                     Stenographers; Managers. \n110        Foremen; Clerks; Telephone Operators; Salesmen;  \n                       Policemen; Electricians. \n100+       Machine Operators; Shopkeepers; Butchers; Welders; \n                       Sheet Metal Workers. \n100-        Warehousemen; Carpenters; Cooks and Bakers; \n                      Small Farmers; Truck and Van Drivers. \n90            Laborers; Gardeners; Upholsterers; Farmhands; \n                        Miners; Factory Packers and Sorters.