What is the Range of IQ Scores?

The range of IQ scores is 20-70 is mental retardation, 70-79 is borderline deficiency, 80-89 is dullness, 90-109 is average/normal, 110-119 is superior intelligence, 120-129 is very superior intelligence, 130-139 is gifted and 140 and above is genius or near genius.