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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
Measures of central tendency are used to describe what is normal for a set of data. Mean, median, and mode are the three measures of central tendency. The mean and median can only be used for numerical data; however the mean is more sensitive to outliers than the median.