How are these numbers calculated?

Big Games

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

Week of 8/14100.0*Chance in playoffs100.0*Home Advantage100.0*Average seed
Southern 2 Dunedin 13 In
West Auckland 8 Canterbury 7 (ot)+1.2
West Auckland 6 Canterbury 5 Yes
Week of 8/21None
Chance Will Make Playoffs