How to calculate Avg. Monthly Return ?

Hello everyone,
1.do you know how TS calculate Avg. Monthly Return and Std. Deviation of Monthly Return ?
2. What's relationsip between them ?
Thank you very much!
 
With no positive integers x, y, and z such that xn + yn = zn where n is an integer greater than 2. At least that's what I use...
 
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