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:
| Pick # | NFL Team | Player | Position | College |
| --- | --- | --- | --- | --- |
| 183 | Tampa Bay Buccaneers | Parnell Dickinson | Quarterback | Mississippi Valley State |
| 184 | Seattle Seahawks | Dick Dixon | Defensive tackle | Arkansas State |
| 185 | Miami Dolphins | Joe Ingersoll | Guard | UNLV |
| 186 | Dallas Cowboys | Greg Schaum | Defensive Tackle | Michigan State |
| 187 | Cincinnati Bengals | Bob Bateman | Quarterback | Brown |
| 188 | New York Jets | Abdul Salaam | Defensive end | Kent State |
| 189 | Cleveland Browns | Steve Cassidy | Defensive tackle | Louisiana State |
| 190 | Chicago Bears | Jerry Muckensturm | Linebacker | Arkansas State |
| 191 | Philadelphia Eagles | Carl Hairston | Defensive end | Maryland-Eastern Shore |
| 192 | Cincinnati Bengals | Carmen Rome | Defensive back | Miami (OH) |
| 193 | Atlanta Falcons | Karl Farmer | Wide receiver | Pittsburgh |
| 194 | San Francisco 49ers | Jay Chesley | Defensive back | Vanderbilt |
| 195 | Buffalo Bills | Jackie Williams | Defensive back | Texas A&M |
| 196 | Kansas City Chiefs | Rod Wellington | Running back | Iowa |
| 197 | Houston Oilers | Larry Harris | Defensive tackle | Oklahoma State |
| 198 | Detroit Lions | Garth Ten Napel | Linebacker | Texas A&M |
| 199 | New York Jets | James Richards | Running back | Florida |
| 200 | Miami Dolphins | John Owens | Defensive end | Tennessee State |
| 201 | New Orleans Saints | Ed Bauer | Guard | Notre Dame |
| 202 | New England Patriots | Perry Brooks | Defensive tackle | Southern |
| 203 | St. Louis Cardinals | Phil Rogers | Running back | Virginia Tech |
| 204 | Oakland Raiders | Clarence Chapman | Wide Receiver | Eastern Michigan |
| 205 | Cincinnati Bengals | Ken Kuhn | Linebacker | Ohio State |
| 206 | Minnesota Vikings | Larry Brune | Defensive back | Rice |
| 207 | Los Angeles Rams | Larry Buie | Defensive back | Mississippi State |
| 208 | Dallas Cowboys | David Williams | Running back | Colorado |
| 209 | Pittsburgh Steelers | Barry Burton | Tight end | Vanderbilt |
Question:
what is the average number of defensive backs chosen in the seventh round?
Answer:
5