IQ scores are measured with a test designed so that the mean is 101 and the standard deviation is 14. 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 -2 or greater than 2.)

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

he lower z score boundary is??