well it don't look that bad this windows 7 shows just sitting here at toms doing nothing else uses 2.62 right now so you at 2.9 is not too far off the mark ? this should also change as memory is accessed and being used , and goes up and down .. [its higher at/just after start up as I just did when I gave my reading] its now down to 1.8...
and a lot depends on what services are running or background tasks ? anything between 1.5-3 gb in use can be all system reserve
now being here at toms using internet explorer is my highest ram user I exit the internet and my useage drops to 1.70 ??
see ???? all about whats running and how it utilizes the memory and releases it after its closed or not running - [like chrome can use memory up and still not release it back to the system as it should ]
google ''windows 10 high memory'' and see all the things on it ??
example
https://www.reddit.com/r/Windows10/comments/3g9rnr/windows_10_high_cpu_and_memory_usage/
his screen shot
http://i.imgur.com/C9GZHX0.jpg
http://www.technewstoday.com/25473-is-microsoft-windows-10-using-high-memoryram-heres-the-fix/
thing is you can count on windows taking around 2gb right off the top for its self - that's just how it is