हिंदी

Assessment of Intelligence

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Estimated time: 6 minutes
CBSE: Class 12

Definition: Normal Curve

The frequency distribution for the IQ scores tends to approximate a bell-shaped curve, called the normal curve.

CBSE: Class 12

Key Points: Assessment of Intelligence

  • First Intelligence Test – Alfred Binet and Theodore Simon (1905) developed the first formal intelligence test.
  • Average IQ – The mean IQ score is 100 for all age groups.
  • Normal Distribution – IQ scores follow a bell-shaped (normal) curve; most people score around the average.
  • Normal Range – IQ between 90–110 is considered average intelligence.
  • Low IQ – IQ below 70 indicates intellectual disability (about 2% of population).
  • High IQ – IQ above 130 indicates giftedness or very superior intelligence (about 2% of population).
  • Use of IQ Tests – Intelligence tests help identify individuals at both high and low extremes of intellectual ability.
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