When someone vomits blood, it may be as a result of the oesophagus being inflamed or injured. It may also result from a bleeding stomach ulcer as well as a tear in the blood vessels located in the throat or stomach. The condition is known medically as hematemesis.

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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....