The accompanying data contains the depth​ (in kilometers) and​ magnitude, measured using the Richter​ Scale, of all earthquakes in a particular region over the course of a week. Depth is the distance below the surface at which the earthquake originates. A one unit increase in magnitude represents ground shaking ten times as strong​ (an earthquake with magnitude 4 is ten times as strong as an earthquake with magnitude​ 3). Complete parts​ (a) through​ (d) below.

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