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
Red Sox 361 Indians 260 +8.9
+0.7
Blue Jays 271 Brewers 305 +2.1
+0.1
Tigers 310 Phillies 195 -1.0
-0.0
White Sox 200 Americans 164 +0.7
+0.0
Nationals 169 Twins 250 -0.5
-0.1
Pirates 247 Rays 191 *+0.1
Week of 4/17100.0*Chance in playoffs100.0*Average seed
Rays 194 Red Sox 226 +6.5
+0.7
Twins 232 Pirates 218 -5.7
-0.3
Americans 217 Tigers 230 +2.1
Brewers 298 White Sox 277 +1.7
+0.0
Phillies 225 Blue Jays 294 -0.2
-0.0
Week of 4/24100.0*Chance in playoffs100.0*Average seed
Blue Jays 251 Tigers 123 -5.5
+0.3
Red Sox 236 Pirates 187 In
+0.6
Indians 266 Twins 250 +1.7
+0.3
Brewers 257 Americans 351 +0.5
+0.2

* 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