Video/audio data rates for avi files

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Pengwuino
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Ok something is confusing me, I have this file here...

.avi

102,892 KB size
640x480
11m:36s

Audio:
Bit rate: 127kbps
MPEG Layer-3

Video:
23 frames/econd
147kbps
24bit
XVID Compression

Now I'm kind of confused... I calculated the overall data rate to be 1200kbps or so... yet those only seem to add up to 300kbps... how are you suppose to calculate this stuff?
 

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audio or video rate?
 
Yah it doesn't add up dduardo :) The video should have been 1200kbps using the real size and time but the two bit rates don't add up to that.