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The arithmetic mean is the most common measure of central tendency. It is simply the sum of the numbers divided by the number of numbers. The symbol Î¼ is used for the mean of a population. The symbol M is used for the mean of a sample. The formula for Î¼ is shown below: Î¼ = Î£X/N
1 Measures of Central Tendencyâ¢ These are statistical terms that try to find the âcenterâ of the numbers that are in a group of data.â¢ Mean â averageâ¢ Median â middleâ¢ Mode â most common or most popularâ¢ Outlier â a number in a set of data that is much bigger or smaller than the rest of the numbers. 2  3.