## Concept:

# Median

## Headline

The value in the "middle" of a sorted sequence

## Citation

(http://en.wikipedia.org/wiki/Median, 21 April 2013)

In statistics and probability theory, the median is the numerical value separating the higher half of a data sample, a population, or a probability distribution, from the lower half. The median of a finite list of numbers can be found by arranging all the observations from lowest value to highest value and picking the middle one (eg, the median of {3, 5, 9} is 5). If there is an even number of observations, then there is no single middle value; the median is then usually defined to be the mean of the two middle values,... which corresponds to interpreting the median as the fully trimmed mid-range.

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