140 or above genius or close to genius 120-140, excellent intelligence 110-120, higher intelligence 90-110, ordinary intelligence 80-90, slow and even low-energy 70-80, between slow and low-energy (each can Classified as imbecile) Those below 70 are defined as imbecile. The IQ of Americans is about 101. The IQ of Japanese is about 102~103. The IQ of Chinese is 110. The IQ of 13-year-old boys is generally about 90.