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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
Therefore it is important to be able to quantify the normal length as used above, and this is what central tendency is all about. The arithmetic mean is one of the most commonly used measures of central tendency. For a set of numbers, the mean is simply the average, i.e. sum of all the numbers divided by the number of numbers.