Question

in an intelligence test a 10 year old child was found to have mental age of 12 years .his iq is

Answer 1

IQ = MENTAL AGE/ CHRONOLOGICAL AGE * 100
=> 12/10 *100
=> 12 *10
=> 120

Answer 2

IQ was originally computed by taking the ratio of mental age to chronological (physical) age and multiplying by 100. Thus, if a 10-year-old child had a mental age of 12 (that is, performed on the test at the level of an average 12-year-old), the child was assigned an IQ of 12/10 × 100, or 120.