Weighted polls

Hi guys!

I wish to make a poll where each users vote will be weighted, their weight depending on how often they have guessed correctly in former polls.

For example:

My friend answers the poll: “what is 5 times 2?” with his answer (multiple choice) being 9.

Two days later, I am done calculating and I now find out that the correct answer is 10.

Therefore, I assign my friend 0 points, and his weight is 0 correct / 1 answer = 0 %

A couple of weeks later, he has answered more questions correctly and his weight has changed to 66%, and now every time he votes, his vote will count 0,66 points.

Of course it is user-based 🙂
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Is there any plugin in existence that does this? I need it badly!

PM with offers otherwise 🙂