IQ scores are measured with a test designed so that the mean is 83 and the stand

Question

IQ scores are measured with a test designed so that the mean is 83 and the standard deviation is 12. Consider the group of IQ scores that are unusual What are the z scores that separate the unusual lQ scores from those that are usual? What are the IQ scores that separate the unusual IQ scores from those that are usual (Consider a value to be unusual if its z score is less than 2 or greater than 2. What are the z sccres that separate the unusual IQ scores from those that are usual? The lower z score boundary is L (Simplify your answer)

Explanation / Answer

A) The lower z score boundary is -2 (given)

B) The lower bound earthquake boundary is

mean - (Z score)* standard deviation = 1.286 - 2(0.576) = 1.286 - 1.152 = 0.134

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