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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
* High school completion rates. There are three commonly reported descriptive statistics called measures of central tendency. The mean is the preferred method of calculating the center of your data set. But when outliers emerge, the median is an alternative that is not affected by these unrepresentative scores.