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Mean
The mean is the average value of all data values. Also known as arithmetic mean. The mean is calculated by adding all data values, then dividing the total of all added data values by the total number of data values.
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Median
The median is the middle data value, when all data values are ordered from least to greatest. If the sample / population size is odd, the median will be located in the middle If the sample / population size is even, there will be two numbers in the middle. Add the two numbers together, then divide by 2. The final answer is the media
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Mode
The mode is the data value or number that occurs the most. The mode can be placed into three different categories: 1. Unimodal – One mode 2. Bimodal – Two modes 3. Multimodal – Multiple modes (more than two)
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Midrange
The data value that is midway between the minimum value and maximum value. The midrange is calculated by adding the minimum value and maximum value, the divide the result by 2.