R : How to merge multiple data.frames and sum and average columns at the same time in R

R : How to merge multiple data.frames and sum and average columns at the same time in R

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Group Data Frame Rows by Range in R (2 Examples) | Aggregate Interval, Year & Date | dplyr Package
Group Data Frame Rows by Range in R (2 Examples) | Aggregate Interval, Year & Date | dplyr Package
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