question about the dorms and # of students

[Tara]

--- hp_lexicon at yahoo.com wrote:
> I've done a fairly good estimate of the number
> of kids in the Great 
> Hall scene and it comes out to about 400. 

Speaking of student numbers, I have a question. 
We know that in the first year's dorm for
Gryffindor there are 5 four-poster beds.  So can
we assume there is only 1 first years dorm?  The
reason I ask is that it seems like an awfully
small number.  Can we assume that it is a similar
number for the second thru seventh years?  That
only makes it 35 students total in Gryffindor,
give or take a few.  Now, if there are supposed
to be about 400 total, and there's only 4 houses,
why is there a paltry 5 kids in the first years
dorm for Gryffindor?  Is Gryffindor a hard house
to get into?  I always figured there was a fairly
even amount in each house, but if we take the
number of first years in harry's dorm and average
it out among all 4 houses and all 7 years, that's
not even 200 students.  So what gives?  Is my
math off??

Tara

=====
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"...people meeting in secret all over the world 
were holding up their glasses and saying in hushed 
voices:" To Harry Potter - the boy who lived!"

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