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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
The most commonly used measure of central tendency is the mean. It is obtained by finding the sum of all data items and then dividing it by the number of items. Use the mean to describe the middle of a set of data that DOES NOT have an outlier.