From the Following Table of Values and Corresponding Sample Sizes

question 42

Short Answer

From the following table of values and corresponding sample sizes, calculate the weighted mean.

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Definitions:

Ash Column

A large plume of volcanic ash that is ejected into the atmosphere during a volcanic eruption.

Composite Volcanoes

Volcanic structures formed from alternating layers of lava flows, ash, and other volcanic debris.

Island Arc

Curved chains of volcanic islands located at convergent tectonic plate boundaries, often formed from the subduction of an oceanic plate under another oceanic plate.

Mid-ocean Ridge

An underwater mountain range, formed by plate tectonics, that marks the site of upwelling magma creating new oceanic crust.