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
Nationals 169 Twins 250 +9.8
+1.6
Pirates 247 Rays 191 +0.9
Red Sox 361 Indians 260 -0.9
-0.1
White Sox 200 Americans 164 +0.2
Tigers 310 Phillies 195 +0.1
+0.1
Blue Jays 271 Brewers 305 *+0.1
-0.1
Week of 4/17100.0*Chance in playoffs100.0*Average seed
Twins 232 Pirates 218 +21.1
+1.9
Rays 194 Red Sox 226 +0.8
+0.1
Phillies 225 Blue Jays 294 -0.7
+0.0
Indians 192 Nationals 281 +0.7
+0.2
Brewers 298 White Sox 277 -0.3
Americans 217 Tigers 230 +0.2
+0.1
Week of 4/24100.0*Chance in playoffs100.0*Average seed
Indians 266 Twins 250 -24.5
-1.2
Brewers 257 Americans 351 +14.4
+0.3
Blue Jays 251 Tigers 123 -9.9
-0.2
Rays 179 Nationals 289 +3.8
+0.3
Phillies 202 White Sox 258 -1.7
-0.1
Red Sox 236 Pirates 187 +1.1
-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