Posted by **Steph** on Saturday, October 22, 2011 at 7:45pm.

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

A) 0.0026

B) 0.4987

C) 3.00

D) 0.9974

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