Are 8 GB of RAM sufficient to run Yosemite?

Are 8 GB of RAM sufficient to run Yosemite?
I watched a YouTube review and the reviewer stated that Yosemite OS takes up 7 GB of RAM to run.   That would not allow you to do many things at once.   Is there a way to disable apps or extensions you don't need to free up more space?
Hesitant to update.

I'm on Yosemite at the moment and the only application open is Firefox; I also have absolutely no items listed in Login/Startup items as I prefer to open apps as I need them, and this is a screenshot of Activity Monitor:
FF is using over 1 GB and the total being used is just over 3 GB at the moment. FWIW, as long as the middel area is green, you're fine.

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