Discussion
The calculation of mental age basically involves :
Answer: A
Mental age rests on the procedure and logic of developmental norms.
Developmental (age) norms show the typical performance of children at successive ages. A child's mental age is the age whose typical performance his or her score matches: a child who passes the items typically passed by eight-year-olds has a mental age of 8, whatever the chronological age. Binet's scales were built this way.
Within-group norms, such as percentiles and standard scores, compare a person with others of the same age instead of placing him on an age scale. Grade equivalents compare achievement across school grades, and comparing gender differences on an item is a question of item bias, not of mental age.
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