Table:
text: Washington Redskins draft history
1950s
1957 Draft
Round Pick Overall Name_ Position_ College
1 9 9 Don Bosseler FB Miami (FL)
2 8 21 Joe Walton E Pittsburgh
3 8 33 Ed Sutton HB North Carolina
4 3 40 Jim Podoley HB Central Michigan
4 8 45 Vince Scorsone G Pittsburgh
6 8 69 J. T. Frankenberger OT Kentucky
7 8 81 Wally Merz OT Colorado
8 8 93 Paul Lopata E Central Michigan
9 8 105 Galen Laack G Pacific [h ]
10 8 117 Don Dobrino RB Iowa
11 8 129 Dick Foster OT Idaho
12 8 141 Wade Mitchell QB Georgia Tech

text: Washington Redskins draft history
1950s
1957 Draft
Round Pick Overall Name_ Position_ College
13 8 153 Claude Austin RB George Washington [b ]
14 8 165 George Rice OT Wofford
15 8 177 Brad Bomba E Indiana
16 8 189 Joe Brodsky RB Florida
17 8 201 Fred Brock RB Wheaton
18 8 213 Ed Sakach G George Washington [b ]
19 8 225 John Bauer RB Villanova
20 8 237 Buddy Frick E South Carolina
21 8 249 Sam Owen RB Georgia Tech
22 8 261 Ed Voytek G Purdue
23 8 273 Al Viola G Northwestern
24 8 285 Bob Jennings C Furman
25 8 297 Dick Sassels OT Catawba
26 8 309 Paul Rotenberry RB Georgia Tech

text: Washington Redskins draft history
1950s
1957 Draft
Round Pick Overall Name_ Position_ College
27 8 321 Ormand Anderson OT Georgia Tech
28 8 333 Guy Martin RB Colgate
29 8 345 George Benedict E Springfield
30 7 356 Art Luppino RB Arizona

Question: What is the Washington Redskins draft history for the Central Michigan average overall when the election was 8' 1957, 1950s?