Table:
text: 1974 Cleveland Browns season
NFL Draft
NFL Draft
Round Overall Player Position_ School_Club_Team
2 40 Billy Corbett Offensive Tackle Johnson C. Smith
5 118 Mark Ilgenfritz Defensive End Vanderbilt
6 146 Billy Pritchett Running Back West Texas A&M
7 163 Bob Herrick Wide Receiver Purdue
7 171 Gerry Sullivan Offensive Tackle Illinois
8 199 Eddie Brown Defensive Back Tennessee
9 224 Dan Scott Guard Ohio State
10 238 Mike Puestow Wide Receiver North Dakota State
11 274 Tom Gooden Kicker Harding
12 302 Ron McNeil Defensive End North Carolina Central
13 327 Mike Siefert Defensive End Wisconsin
14 352 Bob Hunt Running Back Heidelberg
15 380 Ransom Terrell Linebacker Arizona

text: 1974 Cleveland Browns season
NFL Draft
NFL Draft
Round Overall Player Position_ School_Club_Team
16 407 Preston Anderson Defensive Back Rice
17 430 Carlton Buchanan Defensive Tackle SW Oklahoma

Question: What is the average round if there is a defensive back and under 199 overall in the 1974 NFL Draft Cleveland Browns season?