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Levels of Intelligence - Distribution of I.Q.s in the Population

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Topics

  • Introduction
  • Core Concept
  • I.Q. Distribution
  • Real-Life Application
  • Key Point Summary
CISCE: Class 12

Introduction

When intelligence tests are administered to thousands of people, the scores reveal a pattern known as a “bell curve” or normal distribution. Most people score near the average, while very few have very high or very low scores.

CISCE: Class 12

Core Concept

  • I.Q. (Intelligence Quotient) indicates cognitive ability compared to the overall average.
  • The average I.Q. is set at 100.
  • Most people score in the middle, with fewer at the extremes.
CISCE: Class 12

I.Q. Distribution

CISCE: Class 12

Real-Life Application

Imagine 100 students in a school:

  • Approximately 68 individuals will have IQs between 85 and 115 (average).
  • Only 2 or 3 will score lower than 70 or above 130.
CISCE: Class 12

Key Point Summary

  • Most people have average I.Q.s (85–115).
  • Very high or low I.Q.s are rare.
  • The normal curve helps visualize this distribution.

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