A measure of center. The middle value of a set of ordered numbers. 50% of the set lies on either side of the median. Like mean, the median does not have to be a member of the set, so if the set has an even number of elements, the median is halfway between the two middle members.
R Example
> lst <- c(1:34, 35, -22)
> lst
[1] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
[20] 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 -22
> median(lst)
[1] 17.5
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