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 -14.7
-1.8
Blue Jays 271 Brewers 305 +1.9
Red Sox 361 Indians 260 -1.3
Tigers 310 Phillies 195 -0.4
+0.1
Pirates 247 Rays 191 -0.2
Nationals 169 Twins 250 *-0.1
Week of 4/17100.0*Chance in playoffs100.0*Average seed
Americans 217 Tigers 230 -10.8
-1.7
Phillies 225 Blue Jays 294 -2.4
Brewers 298 White Sox 277 +2.3
+0.1
Twins 232 Pirates 218 -0.2
-0.1
Rays 194 Red Sox 226 -0.2
+0.1
Indians 192 Nationals 281 +0.0
Week of 4/24100.0*Chance in playoffs100.0*Average seed
Brewers 257 Americans 351 +1.4
Indians 266 Twins 250 -0.2
Rays 179 Nationals 289 +0.0
Phillies 202 White Sox 258 +0.0

* A starred number could be exactly 0 or just really small. The simulation did not run long enough to know.

Games Above .500
Chance Will Make Playoffs