Number of pupils at Hogwarts ?miscalculation?

[radius_squared at hotmail.com]

No: HPFGUIDX 30280

At the Yule Ball, there were "about a hundred smaller, 
lantern-lit ones 
> [tables], each seating about a dozen people". This would lead one to 
expect 
> that there would be over 1000 pupils at the ball. 


Here is a mistake concerning the books that no one has picked up on 
yet. Let's say there were 200 people in each house. That means about
86 people per year. Half of those would be boys, so about 43 boys per 
year per house. When Harry mentions his "dorm," there are at most 7 or 
eight boys in his year, while, according to statistics, there should 
be at least 40. Did I make a stupid mistake and miss something, or 
have I made a point?

-Hannah

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