I corrected a bad Makefile and submitted the correction to the author of weighted_mean.
Makefile: ERROR: command returned 2: make.exe #5
The corrected Makefile is in the issue wording text itself.
The author of weighted_stats made a perfect copy of weighted_mean ( and that Makefile is also bad. ). I have a corrected Makefile. I emailed him and attached the corrected Makefile.
By the way both 'weighted_mean' and 'weighted_stats' work GREAT.
So, there exists no good reason to loose them.