Extinct is a term used to refer to anything that is no longer active such as a volcano. It is also be used to refer to a species that is extinct and has died out. Some animal species that ever existed but have gone extinct, include the dinosaurs and the mammoths.
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what does extinct mean
no longer in existence; that has ended or died out: an extinct species of fish.
no longer in use; obsolete: an extinct custom.
extinguished; quenched; not burning.
having ceased eruption; no longer active: an extinct volcano.
In mathematics and statistics, the arithmetic mean , or simply the mean or average when the context is clear, is the sum of a collection of numbers divided by the number of numbers in the collection....