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If x is a binomial random variable,then the standard deviation of x is given by
Pegmatite
An igneous rock containing very large crystals, which may be centimeters to meters long.
Igneous Pegmatite
A coarse-grained igneous rock composed primarily of large crystals, often containing rare minerals.
Magma
The molten or semi-molten natural material from which all igneous rocks are derived, located beneath the Earth's surface.
Welded Texture
A texture found in volcanic rocks, formed when hot volcanic ash and debris fuse together under pressure.
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