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
Blue Jays 271 Brewers 305 +10.6
+1.5
White Sox 200 Americans 164 +0.4
Red Sox 361 Indians 260 -0.3
+0.1
Tigers 310 Phillies 195 *+0.1
+0.1
Week of 4/17100.0*Chance in playoffs100.0*Average seed
Brewers 298 White Sox 277 +21.9
+2.0
Rays 194 Red Sox 226 +1.4
+0.1
Twins 232 Pirates 218 -1.0
-0.1
Phillies 225 Blue Jays 294 -0.4
+0.1
Americans 217 Tigers 230 +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 -25.9
-0.9
Red Sox 236 Pirates 187 +13.0
+0.3
Indians 266 Twins 250 +11.0
+0.2
Blue Jays 251 Tigers 123 -8.8
-0.1
Rays 179 Nationals 289 -3.3
Phillies 202 White Sox 258 +1.1
+0.1

* 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