tenure coach years record pct.
tenure
coach
years
record
pct .
minimum_number minimum_parsed minimum_year maximum_number maximum_parsed maximum_year
number
number number1 number2 number3
number
timespan text number score number
1892 shelby fletcher 1 4-6-1 1
what was the average number of years served by a coach ?
WP VBD-AUX DT JJ NN IN NNS VBN IN DT NN .
4
select avg ( c3_number ) from w