I have (average 1 and SD 1), (average 2 and SD 2), and (average 3 and SD 3), I took an average of average 1, average 2, and average 3. How can I calculate the standard deviation (SD) for the average?
http://theanalysisofdata.com/probability/2_3.html
https://www.bipm.org/en/committees/jc/jcgm/publications
Reminder: we are talking about rules for Variance
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