Discrepancy between VBR files in ITunes

I've noticed that all of my VBR mp3 files show different bitrates in iTunes 9.0.1.8 compared to Windows Explorer. For example, in Windows Explorer an mp3 file may be listed as 320kbps but in iTunes it shows up as 187kbps(VBR).
Can anyone help explain, in non-technical terms, why this is and how I can know what the correct bitrate is? Thanks

Since VBR files consist of tiny sections with different bit rates, it is possible to look at one section and incorrectly report that as the bitrate. I am pretty sure that iTunes is giving the correct reading.
You can try the file in another player such as Winamp or Windows Media Player to get a third opinion.
You can also get the exact bitrate mathematically, which I can explain if you are interested.

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