There are many measures of central tendency that are used when we are exploring data. For example, there is the mean. The mean is basically the average which can be found by adding all the values up and then dividing by the amount of numbers. Then, there is the median which is the number that is exactly in the middle. The mode is the number that occurs most often. There are also measures of dispersion. One is the variance which can be obtained by the equation:
The square-root of the variance is the standard deviation. Also, there are quartiles when exploring data. The lower quartile is the median of the numbers before the median of all numbers, and the upper quartile is the median of the numbers after the median of all numbers.
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