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In addition to racial factors, it seems to me that the majority of all last names fall within the first half of the alphabet. Juts looking at my local phone book, 62% of the last names begin with letters A-M. This means I would expect 62% of top10 students around here to have last names beginning with A-M.
This bias towards the beginning of the alphabet holds true for other categories too. Look at band names, the majority begin with a letter in the first half of the alphabet. Same thing for movie titles. Because we do things alphabetically, I think this will always be the case.
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