In a recent year the magnitudes (Richter scale) of 10, 594 earthquakes were reco

Question

In a recent year the magnitudes (Richter scale) of 10, 594 earthquakes were recorded. The mean is 1.32 and the standard deviation is 0.591. 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 -2 or greater than 2.) What are the magnitudes that separate the unusual magnitudes from those that are usual? The lower bound earthquake magnitude is (Type an integer or a decimal.) The higher bound earthquake magnitude is (Type an integer or a decimal.)

Explanation / Answer

Lower bound earthquake magnitude = 1.32 -2*0.591 = 0.138

Upper bound earthquake magnitude = 1.32 +2*0.591 = 2.502

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