Q: MacBook Pro out of RAM when nothing is running?

Okay so I have a brand new 13 inch non-retina MacBook Pro with a 2.9 GHz i7 and 4GB of RAM. I understand when I am running a game or FCPX why I would get close to or run out of RAM, but as I'm typing this, the only thing I have open is Google Chrome and Activity Monitor. I am using 3.99 out of 4.00 GB. I am planning on upgrading to 8GB soon, but is this normal? I have restarted and that doesn't help me. Here is a picture of Activity Monitor: