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
White Sox 200 Americans 164 -20.2
-1.6
Blue Jays 271 Brewers 305 +1.6
+0.1
Pirates 247 Rays 191 -1.2
Tigers 310 Phillies 195 -1.0
-0.0
Nationals 169 Twins 250 -0.1
Red Sox 361 Indians 260 -0.0
Week of 4/17100.0*Chance in playoffs100.0*Average seed
Americans 217 Tigers 230 -22.3
-1.4
Brewers 298 White Sox 277 +3.1
+0.3
Rays 194 Red Sox 226 +1.9
+0.1
Twins 232 Pirates 218 -1.3
-0.3
Phillies 225 Blue Jays 294 -0.3
-0.1
Week of 4/24100.0*Chance in playoffs100.0*Average seed
Phillies 202 White Sox 258 -2.7
-0.2
Brewers 257 Americans 351 +2.4
+1.3
Blue Jays 251 Tigers 123 -2.3
-0.4
Indians 266 Twins 250 +2.1
-0.4
Red Sox 236 Pirates 187 +0.8
-0.0
Rays 179 Nationals 289 -0.4
+0.1
Games Above .500
Chance Will Make Playoffs