Lewis Terman (1916) developed the original notion of IQ and proposed this scale for classifying IQ scores:
Over 140 - Genius or near genius
120 - 140 - Very superior intelligence
110 - 119 - Superior intelligence
90 - 109 - Normal or average intelligence
80 - 89 - Dullness
70 - 79 - Borderline deficiency
Under 70 - Definite feeble-mindedness
Lewis...fucking..TERMAN