There's not necessarily just one. Probably "one or a few". For instance if the average is 5.000, it could be the result of one 5 or one 4 and one 6, or one 4, one 5, and one 6, etc.
The fact that most are X.000 does lead to the conclusion that there are in fact very few "no camera" votes in the members' challenges. You'd expect that; the benefits of paid membership require a camera.
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