>>510644756 (OP)Retired psychologist here.
Previous to that the de facto level was 95 IQ WAIS for mentally slow--the bottom 40% of population. Basically only suitable for light commercial/farm and preferably domestic work. In contrast self-made billionaires tend to have 1-in-million/in 100K top-range IQ's who can do complex calculus or linear algebra calculations in their heads. Keep that in mind the far-left starts ranting on inequality.
The 95 barrier is quite striking. IQ 96 can manage. A 93 has trouble tying shoes, reading clocks, and making 2-step logical conclusions (e.g. unable to spell a word or give an address that is stamped on the medical form they're asked to fill out).
Most American West Euro whites under 99 IQ have died off. You only see IQ problems with physical disorders, typically.
Yes, IQ tracks race, and the IQ tests since the early 1970's have been gimmicked to hide that for political reasons both in USA and elsewhere.
It's not different races so much as different species between an IQ of 150 and one of 90, let alone 70.