The Intelligence Quotient (IQ) Test Scores Are Normally Distributed with a Mean

question 55

Multiple Choice

The Intelligence Quotient (IQ) test scores are normally distributed with a mean of 100 and a
Standard deviation of 15.
i. What is the probability that a person would score between 85 and 115?
ii. Given a class with 25 students, what is the probability that the class' average IQ score is between
85 and 115?

• A) 0.3414, 0.0228
• B) 0.6826, 0.9772
• C) 0.6826, Approximately zero
• D) 1.0, 0.9544

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