TIL that apparently both Stanford-Binet and Wechsler have classification systems which both define "average" as 90-109. See https://en.wikipedia.org/wiki/IQ_cla

TIL that apparently both Stanford-Binet and Wechsler have classification systems which both define "average" as 90-109. See https://en.wikipedia.org/wiki/IQ_classification https://en.wikipedia.org/wiki/IQ_classification and https://en.wikipedia.org/wiki/Stanford%E2%80%93Binet_Intelligence_Scales https://en.wikipedia.org/wiki/Stanford%E2%80%93Binet_Intelli... (the latter includes the latest scale for Standford-Binet) Google provides many hits of people using average to mean within one standard deviation, or 85-115, but in a few minutes of searching I couldn't figure out a proper authority for that.