The Intelligence Quotient (IQ) test scores are normally distributed with a mean of 100 and a standard deviation of 15. What is the probability that a person would score 130 or more on the test?
A) 0.0228
B) 0.9772
C) 0.4772
D) 0.9544

Question

Quizplus · Accepted Answer

The Z-score for a score of 130 is (130-100)/15 = 2. The probability of a Z-score being 2 or more is 0.0228, which corresponds to the probability of scoring 130 or more.

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