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Is IQ the chief cause of racial differences in the United States?


IQ distribution in the United States.

70-79 – Borderline retarded

Limited trainability. Have difficulty with everyday demands like using a phone book, reading bus or train schedules, banking, filling out forms, using appliances like a video recorder, microwave oven or computer, etcetera, and therefore require assistance from relatives or social agencies in the management of their affairs. Can be employed in simple tasks but require supervision.

80-89 – Below average

Above the threshold for normal independent functioning. Can perform explicit routinized hands-on tasks without supervision as long as there are no moments of choice and it is always clear what has to be done. Assembler, food service.

This is also the I.Q. range most associated with violence. Most violent crime by far is committed by males from this range. This does not imply that all males in this range are violent, nor that all violent males are in this range. But when the modal I.Q. of a group is in this range, one may expect trouble with with many male members of that group.

90-99 – Average

Able to learn a trade in a hands-on manner and perform tasks involving decisions. Craftsman, sales, police officer, clerk. Studies involving some theory are possible from this range upward.

100-109 – Average

Able to learn from written materials. Employable in senior positions.

110-119 – Above average

Able to learn in “college” format. Bachelor degrees. Manager, teacher, accountant. Just capable of taking high-range tests.

120-129 – Borderline gifted

Capable of gathering and inferring own information. Master degrees. Attorney, chemist, executive. About 93 % of high-range candidates score I.Q. 120 or higher.

We used the descriptions of each range from this website.