Historical odds not promising for new coaches
That paid off for the Bucs last year, who won a championship after trading a package of draft picks and cash to the Raiders for Jon Gruden.
The average team goes 4.5 years before changing coaches. The race to find the best coach possible hit a high in 1998, when the average tenure of an NFL head coach shrank to just three seasons, down from a high of 6.1 a decade earlier.
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