Answer:
If Jack is 10 years old and scored a mental age of 8 years old on his IQ test, his IQ score would be 80 using the Terman formula. The Terman formula is commonly used to calculate IQ scores based on the ratio of an individual's mental age to their chronological age. In this case, Jack's mental age is 8 and his chronological age is 10, so his IQ score would be calculated as follows:
IQ = (MA / CA) * 100
= (8 / 10) * 100
= 0.8 * 100
= 80
This means that Jack's cognitive abilities are at the level of an average 8-year-old, even though he is actually 10 years old. His IQ score of 80 falls within the average range of IQ scores, which is typically considered to be between 90 and 110.