How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

Week of 2/14100.0*Chance wins title100.0*Average seed
Illinois State 4 McKendree 2 +0.2
+0.6
Week of 2/21None
Week of 2/28100.0*Chance wins title100.0*Average seed
McKendree 4 Illinois State 5 (ot)+0.9
Waldorf 5 Midland 3 +0.4
Northern Illinois 5 Maryville 8 -0.1
McKendree 3 Illinois State 2 -0.1
Points
Chance Will Win Championship