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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
Such a number is called a. measure of central tendency. The most commonly used measures are as follows. 1. The mean, or average, of numbers is the sum of the numbers divided by . 2. The median of numbers is the middle number when the numbers are writ-. ten in order.