Average file size statistics

Is there any way to calculate, and breakdown, average file sizes for a given directory (or drive)?

Something that can give details such as:|

• Files of 4KB - 22KB: account to 20% of all files
• Files of 32KB - 64KB: account to 10% of all files
• Files of 1MB - 20MB: account to 70% of all files

And so on.

Perhaps you know of a utility that can do that?