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 +15.8
+1.3
White Sox 200 Americans 164 -0.9
-0.1
Red Sox 361 Indians 260 -0.6
Blue Jays 271 Brewers 305 +0.4
+0.0
Nationals 169 Twins 250 -0.0
Week of 4/17100.0*Chance in playoffs100.0*Average seed
Americans 217 Tigers 230 +16.9
+1.2
Phillies 225 Blue Jays 294 -4.1
-0.2
Brewers 298 White Sox 277 +2.8
+0.2
Twins 232 Pirates 218 -1.2
-0.0
Rays 194 Red Sox 226 +0.9
-0.0
Week of 4/24100.0*Chance in playoffs100.0*Average seed
Blue Jays 251 Tigers 123 -9.0
-1.4
Red Sox 236 Pirates 187 +4.4
-0.0
Indians 266 Twins 250 +4.0
+0.1
Brewers 257 Americans 351 -0.8
-0.0
Games Above .500
Chance Will Make Playoffs