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 -16.1
-1.4
White Sox 200 Americans 164 +2.7
+0.2
Red Sox 361 Indians 260 -0.5
Tigers 310 Phillies 195 +0.3
+0.0
Pirates 247 Rays 191 *-0.1
Nationals 169 Twins 250 *+0.1
Week of 4/17100.0*Chance in playoffs100.0*Average seed
Phillies 225 Blue Jays 294 +20.7
+1.9
Brewers 298 White Sox 277 -1.6
-0.1
Twins 232 Pirates 218 -0.7
-0.1
Americans 217 Tigers 230 +0.6
+0.1
Rays 194 Red Sox 226 +0.6
+0.1
Indians 192 Nationals 281 -0.0
Week of 4/24100.0*Chance in playoffs100.0*Average seed
Blue Jays 251 Tigers 123 +38.9
+2.0
Red Sox 236 Pirates 187 +5.6
+0.1
Brewers 257 Americans 351 +2.5
+0.1
Indians 266 Twins 250 +2.3
Phillies 202 White Sox 258 +0.5
+0.2
Rays 179 Nationals 289 -0.4
+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