by whom was it developed?
Karl Pearson.
Standard deviation
The term "standard deviation" was first used in writing by Karl Pearson in 1894, following his use of it in lectures.
what type of dog is a blue heeler UNANSWERABLE what type of dog is an australian cattle? It is a breed of herding dog originally developed in Australia for droving cattle over long distances across rough terrain. how long do they live on an average? A survey of 100 deceased dogs yielded a mean longevity of 13.41 years with a standard deviation of 2.36 years. what is this deviation? In statistics, the standard deviation is a measure of the amount of variation or dispersion of a set of values.
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Standard deviation [SEP] History
The term "standard deviation" was first used in writing by Karl Pearson in 1894, following his use of it in lectures. This was as a replacement for earlier alternative names for the same idea: for example, Gauss used "mean error".