Question I have 4 GB ram says 2.69 usable

Jul 23, 2019
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I was wondering how to fix this.
Bios version: AMI A0.07
BIOS Mode: UEFI
SMBIOS Version: 2.8
Installed Physical Memory: 4.00 GB
Total Physical Memory: 2.69
Available Physical Memory: 8.06
Do I need to buy an 8 GB and take the 2 4GB Out? I'm at a loss plz help