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July 31, 2014

Homework Help: Statistics

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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