Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Player | County | Balls | Wickets | Average | Economy | BBI | 4wi | 5wi |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Ken Shuttleworth Category:Articles with hCards | Lancashire | 553.0 | 24.0 | 11.04 | 2.87 | 4/3 | 1.0 | 0.0 |
| Keith Boyce Category:Articles with hCards | Essex | 573.0 | 28.0 | 12.39 | 3.63 | 4/27 | 1.0 | 0.0 |
| Jack Simmons Category:Articles with hCards | Lancashire | 601.0 | 26.0 | 14.07 | 3.65 | 3/8 | 0.0 | 0.0 |
| David Hughes Category:Articles with hCards | Lancashire | 496.0 | 24.0 | 14.50 | 4.20 | 5/26 | 1.0 | 1.0 |
| Bob Woolmer Category:Articles with hCards | Kent | 727.0 | 32.0 | 16.87 | 4.45 | 4/39 | 1.0 | 0.0 |
| Derek Underwood Category:Articles with hCards | Kent | 597.0 | 24.0 | 17350 | 4.22 | 5/25 | 1.0 | 1.0 |
| Mike Taylor Category:Articles with hCards | Nottinghamshire | 705.0 | 24.0 | 19.83 | 4.05 | 4/26 | 1.0 | 0.0 |
Question:
if the bbi is 4/39 what is the average
Answer:
16.87