In the capture card list http://www.vcdhelp.com/capturecards.php there are marks given, rating 1-10. I presume these are the average scores of the number of votes given. But what does the number in brackets signify eg: Matrox 2500 7.4 (8.0), what is with the 8??

I also calculated the average score for Pinnacle Studio Deluxe at 8.66, but it is only stating 7.7. Is this a mistake?