The median of a series of variables is the 'middle value,' or the value below and above which 50% of the observations lie. The median is frequently used as a measure of central tendency when the mean is unreliable, i.e. the distribution of variables is significantly skewed. If a series has an even number of variables, it is not uncommon to use the mean of the two middle variables as the median.

Take the following seven heights (in inches:)

65, 62, 65, 68, 67, 70, 66

To calculate the median, order the values (62, 65, 65, 66, 67, 68, 70.) The median value (fourth, either in ascending or descending order) is 66.

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