Answer: Mental age of 9 year old
Step-by-step explanation:
Mental age is the criteria of measuring age as per mental ability of the person. Standardized intelligence examination is performed for measurement and evaluating the mental ability of the person. This test result dfepicts the age in which a person can reach upto measured mental stage.
According to the question,Jarrod would be displaying mental age of 9 year old by taking Binet's original intelligence test as he is able to perform functions of 9 year old child even if he is actually 7 year old.