If I undestood you right, then you can try something like that:

$i = 0,
$total = 0;
while ($line = <FILE>) {
  chomp $line;
  if ($line =~ /"([\d\/]+)\s([\d:.]+)"\s+"([\d.]+)"/) {
    total += $3;
    $i++;
  }
}
$avarage = $total/$i;
[download]

This will give you only the avarage of the number in the right column, but you can easily do that for the time and date (write a timeAvarage function), I'll leave that for you.

Thanks.

Hotshot