Why do we use the standard deviation?

Fisher, parameterisation, efficiency and CLT

It feels like knowledge has advanced, and is continuing to advance, so quickly that in order to keep up there is no time at school to explain how and why things are the way they are. For me, standard deviation is one of those things: something that is simply stated as thee way to measure dispersion with no explanation for why we do this convoluted process of squaring, averaging …

data science deviation math programming python standard statistics