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
Pirates 247 Rays 191 +19.5
+1.5
Red Sox 361 Indians 260 -0.7
Blue Jays 271 Brewers 305 +0.3
White Sox 200 Americans 164 +0.3
Nationals 169 Twins 250 +0.3
+0.0
Week of 4/17100.0*Chance in playoffs100.0*Average seed
Twins 232 Pirates 218 -12.8
-0.9
Rays 194 Red Sox 226 +2.0
+0.1
Phillies 225 Blue Jays 294 -1.5
-0.1
Americans 217 Tigers 230 -0.4
-0.1
Brewers 298 White Sox 277 -0.4
-0.0
Indians 192 Nationals 281 -0.2
-0.1
Week of 4/24100.0*Chance in playoffs100.0*Average seed
Red Sox 236 Pirates 187 -38.5
-1.8
Blue Jays 251 Tigers 123 -5.6
-0.1
Brewers 257 Americans 351 +2.9
+0.1
Indians 266 Twins 250 +2.8
+0.4
Rays 179 Nationals 289 -0.3
Phillies 202 White Sox 258 -0.2
Games Above .500
Chance Will Make Playoffs