Regarding yesterday’s CotP, an astute reader asked why there was such a focus on the illusory, central-tendency, “Arithmetic Mean Average” but not on the, “Standard Deviation”. Thought that was a good callout since will generally want to look at both types (a central-tendency type and a dispersion type). As such, Chart Four has been altered (the previous CotP remains unaltered).
Web Tortoise 
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