How are these numbers calculated?

Big Games

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

Week of 4/10100.0*Chance in playoffs100.0*Average seed
Tigers 310 Phillies 195 -2.3
-0.7
White Sox 200 Americans 164 +0.4
-0.0
Blue Jays 271 Brewers 305 -0.1
-0.1
Pirates 247 Rays 191 -0.1
Red Sox 361 Indians 260 +0.1
Week of 4/17100.0*Chance in playoffs100.0*Average seed
Phillies 225 Blue Jays 294 -0.1
-0.5
Brewers 298 White Sox 277 -0.1
+0.0
Twins 232 Pirates 218 -0.1
Indians 192 Nationals 281 -0.0
Week of 4/24100.0*Chance in playoffs100.0*Average seed
Phillies 202 White Sox 258 -0.3
Indians 266 Twins 250 -0.3
Rays 179 Nationals 289 +0.0
Games Above .500
Chance Will Make Playoffs