What does 7.5/10 mean in terms of looks?

Two guys (they’re pretty average looking in my opinion) rated my looks when I sent them a pic and said I was 7.5/10. I’m not sure what it actually means and I don't know if it’s a good thing or not. I get called “pretty” or “gorgeous” from many people yet this rating is kind of weird and offensive. What does it actually mean?
What does 7.5/10 mean in terms of looks?
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