IQ scores are typically scaled to have mean $100$ and standard deviation $15$. What is the mean IQ score for a person with an average IQ?

• A. $100$
• B. $0$
• C. $15$
• D. $115$

Answer: (A)

Verified step by step guidance

1. Understand that IQ scores are standardized to have a mean (average) of 100 and a standard deviation of 15. This means the average IQ score in the population is 100.
2. Recognize that the term 'average IQ' refers to the mean IQ score, which is the central value around which IQ scores are distributed.
3. Recall that the mean of a normal distribution is the value that represents the average or expected score.
4. Since the problem states the mean IQ is 100, the mean IQ score for a person with an average IQ is simply this mean value.
5. Therefore, the mean IQ score for a person with an average IQ is 100.