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 -16.6
-1.4
Blue Jays 271 Brewers 305 +1.2
+0.0
Tigers 310 Phillies 195 -1.0
-0.0
Red Sox 361 Indians 260 -0.5
-0.0
Week of 4/17100.0*Chance in playoffs100.0*Average seed
Americans 217 Tigers 230 -19.7
-1.7
Brewers 298 White Sox 277 +3.0
+0.3
Phillies 225 Blue Jays 294 -2.9
-0.2
Twins 232 Pirates 218 -0.8
-0.1
Rays 194 Red Sox 226 +0.7
+0.1
Indians 192 Nationals 281 -0.0
Week of 4/24100.0*Chance in playoffs100.0*Average seed
Brewers 257 Americans 351 +4.6
+1.8
Phillies 202 White Sox 258 -4.2
-0.7
Red Sox 236 Pirates 187 +3.0
+0.1
Blue Jays 251 Tigers 123 -2.8
-0.2
Indians 266 Twins 250 +2.6
-0.1
Rays 179 Nationals 289 -2.4
+0.1
Games Above .500
Chance Will Make Playoffs