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A child of 16 years scores 75 in an IQ test, his mental age will be ________ years.
1. 12
2. 8
3. 14
4. 15

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Correct Answer - Option 1 : 12

Intelligence refers to a set of different cognitive abilities to think rationally, act purposefully, resolve problems, and deal with the demands of the environment.

  • In 1912, William Stern suggested the concept called Intelligent Quotient (IQ). It refers to the score of a standardized test that assesses and measures human intelligence.

 

An individual’s Intelligence Quotient (IQ) is determined by the formula given below,

\({\bf{Intelligence}}\;{\bf{Quotient}}\;\left( {{\bf{IQ}}} \right) = \frac{{{\bf{Mental}}\;{\bf{Age}}\;\left( {{\bf{MA}}} \right)\;}}{{{\bf{Chronological}}\;{\bf{Age}}\;\left( {{\bf{CA}}} \right)}} \times 100\)

Where,

  • Mental Age is based on intellectual development.
  • Chronological Age is the number of years a person has lived.
  • When A child of 16 years scores 75, his mental age will be:
  • 75 = MA / 16 x 100
  • MA = 75 x 16 /100 
  • MA = 12

Hence, it could be concluded that a child of 16 years scores 75 in an IQ test, his mental age will be 12 years.

 

Refer to the IQ table for further information:

IQ Classification

IQ Range

Genius

140 and above

Very superior

130-139

Superior

120-129

Above-average

110-119

Average

90-109

Below average

80-89

Dull or borderline

70-79

Feebleminded, Moron

50-69

Imbecile

25-49

Idiot

 0-24

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