IQ scores are measured with a test designed so that the mean is 104 and the stan

Question

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

104

and the standard deviation is

13

Consider the group of IQ scores that are unusual. What are the z scores that separate the unusual IQ 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

minus2

or greater than 2.)

What are the z scores that separate the unusual IQ scores from those that are usual?

The lower z score boundary is (Simplify your answer.)

There are still 3 parts remainning. Answer it if you guys know.

Explanation / Answer

Lower z score boundary = -2

Upper z score boundary = 2

Lower IQ score = 104 - 2*13 = 78

Upper IQ score = 104 + 2*13 = 130

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