5.2 The median
The median describes the central value of a set of data. Here, to be precise, we are discussing the sample median, in contrast to the population median.
The sample median
The median of a sample of data with an odd number of data values is defined to be the middle value of the data set when the values are placed in order of increasing size. If the sample size is even, then the median is defined to be halfway between the two middle values. In this course, the median is denoted by m