New Server for MySQL: RAM Question

I have just added MySQL to a dedicated server and ran some queries. sshd is also being used. When I do a free -m the output is:

total used free shared buffers cached
Mem: 1007 722 285 0 80 455
-/+ buffers/cache: 186 821
Swap: 2047 0 2047

Why is 722 out of 1G RAM being used if nobody is accessing anything? Is this normal?

Thanks for any info on this.

 

 

 

 

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