In math, the median is a measure of central tendency that represents the middle value of a dataset when all the data points have been arranged in value order as a list of numbers. To find the median, one needs to arrange the data points from smallest to largest and then pick out the middle number. If the number of data points is odd, the median is the middle data point in the list. If the number of data points is even, the median is the average of the two middle data points in the list. For example, in the data set {13, 23, 11, 16, 15, 10, 26}, the median is 15 because it is the middle number when the data points are arranged in order.