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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 median is another frequently used measure of central tendency. The median is simply the midpoint of the distribution, i.e. there are as many numbers above it as below it. If the number of data points is odd, then the median is simply the middle number. Therefore the median of 3, 5, 6, 9, 15 is 6.