Why is my phone eating up so much ram??

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http://androidforums.com – Hello, I am currently using a note 2 which has been rooted. I I haven't done anything yet like custom roms or over clicking. However, my phone seems to be using up a lot of ram. This is my first ever android device and I can't understand whether this is normal or not. I am running jelly bean 4.1.1. The background apps running on the screen shot adds up to less than 300 mb Attached Images uploadfromtaptalk1353422300990.jpg (62.4 KB) (General)