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Author SHA1 Message Date
ddd72538f1 Update standard-deviation.md 2017-12-13 23:02:21 +11:00
de32a204d2 Create standard-deviation.md
http://www.calculator.net/standard-deviation-calculator.html

As a one-liner it's really long, feel free to optimize the formatting here (or shorten it further somehow).
2017-12-13 23:00:21 +11:00