query on query

Hi,
I have a table like this -
postgres=# \d m
Table "public.m"
Column | Type | Modifiers
--------+---------+-----------
id | integer |
marks | integer |

postgres=# select * from m;
id | marks
----+-------
1 | 27
2 | 37
3 | 17
4 | 27
5 | 18
(5 rows)

I wanted to get cumulative counts of students in different ranges - >90, > 80 , > 70 etc.
>10 5
>20 3
>30 1
>40 0
> 50 0

So each student may get counted many times, someone with 99 will be counted 10 times. Possible to do this with a fat query? The table will have many thousands of records.

Regards,
Jayadevan

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