Based on the records of last year's teams. Author admits last year's records do not directly translate to this year's performance, but it provides a baseline. BTW - does Iowa ever get a tough schedule?
http://www.nj.com/rutgersfootball/i..._the_big_tens_toughest_schedules_in_2015.html
1. Rutgers: 19-5
t-2. Maryland: 17-7
t-2. Nebraska: 17-7
t-2. Illinois: 17-7
5. Minnesota: 16-8
t-6. Ohio State: 14-10
t-6. Wisconsin: 14-10
t-6. Purdue: 14-10
9. Michigan: 13-11
10. Michigan State: 12-12
t-11. Penn State: 11-13
t-11. Iowa: 11-13
t-11. Northwestern: 11-13
14. Indiana: 10-14
http://www.nj.com/rutgersfootball/i..._the_big_tens_toughest_schedules_in_2015.html
1. Rutgers: 19-5
t-2. Maryland: 17-7
t-2. Nebraska: 17-7
t-2. Illinois: 17-7
5. Minnesota: 16-8
t-6. Ohio State: 14-10
t-6. Wisconsin: 14-10
t-6. Purdue: 14-10
9. Michigan: 13-11
10. Michigan State: 12-12
t-11. Penn State: 11-13
t-11. Iowa: 11-13
t-11. Northwestern: 11-13
14. Indiana: 10-14