Often used as a synonym for the 'Mean', but strictly speaking can refer to any statistic that characterizes a set of data.
Measures the locality or centrality of the data. It is expressed through the measures of numerical average, mean, median and mode.
Often called 'the average'. It is the sum of the values in a sample divided by the number of values:
The mean of a population is represented by m.
The middle value in an ordered set of data. If there are an even number of values, the median is the average of the two middle values.
The median of the values 3, 5, 6, 20 is 5.5
The most common value in a set of data.
The mode of 3, 5, 5, 6, 6, 6, 9 is 6.