Comparing children's mental ages, with the mental ages of their same-age peers, produced the first intelligence quotients. This means that if a seven-year-old child was performing as if she were a six-year-old, her IQ would be
A) about 86, below average.
B) about 100, average.
C) about 115, above average.
D) We can't determine based on this information.

Question

Quizplus · Accepted Answer

The concept of IQ is based on the comparison of a child's mental age with the mental age expected of children that are the same chronological age. In this scenario, if a seven-year-old child is performing as if she were a six-year-old, her mental age would be six. To calculate her IQ, we divide her mental age by her chronological age and multiply by 100. Therefore, her IQ would be (6/7) x 100 = 85.7, which is equivalent to approximately 86. This score falls below the average IQ score of 100, indicating that this child is performing below average compared to her peers.

Comparing Children's Mental Ages, with the Mental Ages of Their