**Core Concept**
Normal intelligence quotient (IQ) is a statistical measure that compares an individual's cognitive abilities to those of a large sample of the population. It is calculated based on standardized tests that assess verbal comprehension, visual-spatial skills, and working memory. Normal IQ scores are typically distributed around a mean of 100, with a standard deviation of 15.

**Why the Correct Answer is Right**
The concept of normal IQ is based on the idea that most people's cognitive abilities cluster around the mean, with fewer individuals having scores that are significantly higher or lower. This distribution is often represented by a bell-shaped curve. The standardization of IQ tests ensures that the results are comparable across different populations and over time. In clinical practice, IQ scores are often used to identify cognitive impairments, learning disabilities, or intellectual disabilities.

**Why Each Wrong Option is Incorrect**
**Option A:**
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**Option B:**
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**Option C:**
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**Clinical Pearl / High-Yield Fact**
A common misconception is that IQ scores are a direct measure of intelligence, but they are actually a measure of an individual's relative position within the population. It's essential to remember that IQ scores have cultural and socio-economic biases, which can affect their interpretation.

**Correct Answer:** .