Answer :
If a five-year-old, like Wilbur, performs on an intelligence test at a level that is typical of a four-year-old, then his IQ would be calculated to be 80.
IQ scores are calculated by comparing a person's performance on an intelligence test to the average performance of individuals in the same age group. In this case, since Wilbur is five years old but performs at the level of a four-year-old, his performance is one year behind the norm. An IQ score of 100 is considered average, which means that Wilbur's performance is below average for his age. A score of 70-79 is classified as "borderline intellectual functioning," indicating that Wilbur may need extra support and resources to succeed academically and socially.
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