On a scale from 1-10, I generally suppose the middle (or neutral) is 5 or 6). Scales like this aren't really about accuracy. They're just an abstract concept of a scale from one extreme to another.
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"I got to keep you on your toes. When you think I'll zig, I'll zag. Then when you think I'm gonna zag, I do zag, just to mess you up for the next time, when I might zig" - Lorelai Gilmore