What are the magnitudes that seperate the unusual magnitudes from those that are usual?

SoccerBoss
Category:
Statistics
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Question description

in a recent year the magnitudes (ritcher scale) of 10,594 earthquakes were recorded. The mean is 1.221 and the standard devation is 0.582. Consider the magnitudes thats are unuasual. What are the magnitudes that seperate the unusual magnitudes from those that are usual? ( Consider a value to be unusual if it is z score is less than -2 OR GREATER THAN 2

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