**Mean, median, and mode review (article) | Khan Academy**
https://www.khanacademy.org/math/statistics-probability/summarizing-quantitative-data/mean-median-basics/a/mean-median-and-mode-review

WEBThe arithmetic mean is the sum of all of the data points divided by the number of data points. mean = sum of data # of data points. Here's the same formula written more formally: mean = ∑ x i n. Example. Find the mean of this data: 1 , 2 , 4 , 5. Start by adding the data: 1 + 2 + 4 + 5 = 12. There are 4 data points. mean = 12 4 = 3. The mean is 3 .

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