Category	IQ score range	% of population included in each
Gifted	130 and above	2.27
Above average	115-129	13.59
High average	100-114	34.13
Average	85-115	68.26
Low average	85-99	34.13
Borderline	71-84	13.59
Mild mental retardation	50-55 to 70	2.14
Moderate mental retardation	35-40 to 50-55	0.13

 

 

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Wechsler (1997, 2003) and the DSM-IV-TR (American Psychiatric Associa­tion, 2000).