I highly doubt it. The officer didn't stop you based on your AVERAGE driving speed, they stopped you based on the fact that at the time they sampled you, you were speeding. I tend to agree with what was previously stated, if you're speeding, you probably deserve the ticket, if you weren't then the system is already stacked against you. Your only hope then is what usually happens to people I know...the police officer doesn't show up on court day and the whole thing is dismissed.
Doc