Based on the fact that Sam's mental age is identical to his chronological age, his IQ score is 100.
IQ scores are calculated as:
= Mental age / Chronological age x 100
Assuming the mental and chronological age is x, the formula becomes:
= x / x × 100
= 1 x 100
= 100
Find out more on IQ scores at https://brainly.com/question/6352562.