need help please finding the lower bound and upper bound magnitude earthquakes

timer Asked: Sep 23rd, 2015

Question description

In a recent year the magnitudes​ (Richter scale) of​ 10,594 earthquakes were recorded. The mean is


and the standard deviation is


Consider the magnitudes that are unusual. What are the magnitudes that separate the unusual magnitudes from those that are​ usual?(Consider a value to be unusual if its z score is less than


or greater than​ 2.)

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