EDUCATION (CBSE/UGC NET)

Detailed explanation-1: -Educators have coordinated IQ scores with potential learning capabilities: educable, 50–75; trainable, 25–50; and custodial, 0–25.

Detailed explanation-2: -below 70-75, i.e. significantly below average. If a person scores below 70 on a properly administered and scored I.Q. test, he or she is in the bottom 2 percent of the American population10 and meets the first condition necessary to be defined as having mental retardation.

Detailed explanation-3: -The DSM-IV classifies mental retardation into four stages based on severity: mild (IQ score of 50-55 to approximately 70), moderate (IQ score of 30-35 to 50-55), severe (IQ score of 20-25 to 35-40), and profound (IQ score of less than 20-25).

Detailed explanation-4: -Mental retardation is present in about 2 to 3 percent of the population. It can be defined as cognitive ability that is markedly below average level and a decreased ability to adapt to one’s environment. The onset of the condition occurs during the developmental period, i.e., gestation through age 18 years.