Real average filesize in a set of files...

Posted by JD on Stack Overflow See other posts from Stack Overflow or by JD
Published on 2010-03-08T09:34:28Z Indexed on 2010/03/08 9:36 UTC
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Hi,

I have an apparently "simple" problem but I can't find the solution for some reason...
I have n millions files of different sizes and I want to find the average filesize.
To simplify it, I grouped them in multiples of 16KB.

< 16 KB = 18689546 files
< 32 KB = 1365713 files
< 48 KB = 1168186 files
...

Of course, the simple (total_size / number of files) does not work. It gives an average of 291KB...
What would be the algorithm to calculate the real average...?

Thx, JD

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