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“The odds are quite good, actually—the concept is known as “regression to the mean.” In this case, the Yankees went from an .857 winning percentage down to a .250 winning percentage. A 21-15 record is most likely a lot closer to the Yankees historical winning percentage than either 18-3 or 3-12 are.
The performance of the Boston Red Sox, on the other hand, has never been explicable through statistics.”