QQuestionStatistics
QuestionStatistics
"What percent of the population has an intelligence quotient below 100?
A. 75%
B. 50%
C. 35%
D. 10%"
12 months agoReport content
Answer
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Step 1:Let's solve this step by step:
Step 2:: Understand the IQ Distribution
- IQ scores follow a normal distribution - The mean (average) IQ is 100 - The standard deviation is typically 15 points
Step 3:: Interpret the Normal Distribution
- In a normal distribution, 50% of the population falls below the mean - This means exactly 50% of people have an IQ below 100
Step 4:: Verify the Calculation
- The standard normal distribution is symmetrical - The mean (100) divides the distribution exactly in half - This means precisely 50% of people have an IQ below 100
Step 5:: Eliminate Incorrect Answers
- 75% is too high - 35% is too low - 10% is far too low
Step 6:: Select the Correct Answer
- The answer that matches our calculation is B. 50%
Final Answer
Key Insight: In a normal distribution, exactly half the population falls below the mean, which for IQ is 100.
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