A convenience survey or a self-selection survey is most likely to be affected by bias
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The answer depends on what information the survey collects.
What is the most likely explanation for the results in the graph?
The most likely cause of a plain edge is that someone filed it down, or it was exposed to some kind of extra wear that affected the edge. That makes it a damaged coin worth only 25c, I'm afraid.
mean
Most likely in Athens.