Hi ,
This is in the average usage range, which can normally occur as it is a computer using I-GPU (Internal Processor Graphics) which may have been configured in the bios and reduced the use of allocated memory. usually being 512mb.
Probably in logic between 1 and 2 GB the use of the OS taking 512 to 256 MB shared with internal graphics or some other hardware.
In case you want to reduce the use of Ram ? more since it is within the usage parameters, in my opinion, reducing more RAM use would be to disable Windows services in addition to reducing shared memory in the bios, I think you may have already done that.
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Thanks