I went with 30%, largely because of Baltimore having the tiebreaker. Even if the Dolphins finish 3-1 in their last 4, the Ravens still have to lose twice. And in that scenario, if the Dolphins' 1 loss was to the Steelers or Jets, then we'd have to count on them losing at least 1 as well. I know it's obvious but it would have been REALLY nice if the Dolphins had found a way to close one or more of those games they blew after leading late in the 4th quarter (Bills, Bucs, Panthers).
I'd be interested to know what all goes into these play-off probability calculations, and how heavily different statistics are weighted.