What is IQ? How do psychologists classify people on the basis of their IQ scores?
IQ is calculated using the formula: IQ = (MA / CA) × 100, where MA is Mental Age and CA is Chronological Age. The average IQ is 100, and scores are distributed in a bell-shaped normal curve, with most people falling in the middle range.
Psychologists classify people based on their IQ scores. Individuals with scores between 90–109 are classified as Average (50% of the population). Scores of 110–119 are High average, and 120–130 are Superior. Those scoring Above 130 are considered Very superior or having exceptional talents.
On the lower end, scores between 80–89 are Low average, while 70–79 is Borderline. Individuals scoring Below 70 are classified as Intellectually disabled.
Explanation
The answer defines IQ using the provided formula and explains the normal distribution of scores. It then details the classification of people based on IQ ranges from Table 1.1, covering the spectrum from 'Very superior' to 'Intellectually disabled', adhering strictly to the provided context.