I noticed that most of the time, Activity Monitor tells me that memory used is above 10 Gb (out of 16). But the processes listed doesn't seem to consume as much memory.
I also want to add that my macOS installation is quite clean (and recent).
I don't expect a virus or something to be the origin of a high memory consumption.
This is a 2017 Macbook Pro 15" with macOS Catalina (10.15.2).
At the time the screenshots were taken, I was using Visual Studio Code for web programming with Chrome (12 tabs), Firefox (3 tabs), MySQLWorkBench with no script running, Trello, a 3 page Word document and a freshly created blank Excel spreadsheet.
Do you think it is normal ?