IQ scores are measured with a test designed so that the mean is 105105 and the standard deviation is 1919.

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.)

The higher z score boundary is :

(Simplify your answer.)

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

The lower bound IQ score is :

(Simplify your answer.)

The higher bound IQ score is:

(Simplify your answer.)