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Pooled Standard Deviation: How Do You Calculate It?

When you have the average production of three machines, it is easy to calculate the average or mean production. You just add ...
Yahoo Finance

Here's What Nerds Mean When They Say 'Standard Deviation'

Flickr via Google Images Standard deviation is a concept that's thrown around frequently in finance. So what is it? When working with a quantitative data set, one of the first things we want to know ...