Question
Download Solution PDFIf the chronological age of the child is 60 months and his mental age is 66 months, his IQ is
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFIn 1912, William Stern suggested the concept called Intelligent Quotient (IQ). It referred to a score derived by dividing the mental age with chronological age and multiplying the result with 100.
Alfred Binet and Theodore Simon were attributed to the first attempt to measure intelligence scientifically. In 1905, they developed the first intelligence test known as the Binet-Simon Intelligence Scale. Later in 1908, they coined the term Mental Age (MA) to measure the intellectual ability of a person in comparison to his or her fellow age group, and Chronological Age (CA) refers to a person’s biological age.
Key Points
For example, the chronological age of the child is 60 months and his mental age is 66, his IQ is
Concept: IQ =
Given: Mental age = 66 months = 66/12 years
Chronological age = 60 months = 66/12 years
Solution: IQ=
Important Points
| IQ Range | Descriptive Label |
| Above 130 | Very Superior Intelligence (gifted) |
| 120 to 129 | Superior Intelligence |
| 110 to 119 | High Average Intelligence |
| 90 to 109 | Average Intelligence |
| 80 to 89 | Low Average Intelligence |
| 71 to 79 | Borderline Intellectual Functioning |
| 55 to 70 | Mild Intellectual Disability |
| 40 to 54 | Moderate Intellectual Disability |
| 25 to 39 | Severe Intellectual Disability |
| Below 25 | Profound Intellectual Disability |
Hence, we conclude that the IQ of the child is 110.
Last updated on May 26, 2025
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