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 +28.0
+1.9
White Sox 200 Americans 164 +0.9
Red Sox 361 Indians 260 -0.7
+0.0
Blue Jays 271 Brewers 305 +0.7
-0.0
Nationals 169 Twins 250 +0.1
Week of 4/17100.0*Chance in playoffs100.0*Average seed
Twins 232 Pirates 218 -23.5
-1.3
Rays 194 Red Sox 226 -0.8
-0.0
Phillies 225 Blue Jays 294 -0.7
-0.0
Brewers 298 White Sox 277 -0.4
-0.1
Indians 192 Nationals 281 -0.1
Americans 217 Tigers 230 -0.1
-0.0
Week of 4/24100.0*Chance in playoffs100.0*Average seed
Red Sox 236 Pirates 187 -18.7
-0.7
Blue Jays 251 Tigers 123 -6.9
-0.3
Indians 266 Twins 250 +3.3
+0.2
Brewers 257 Americans 351 +2.7
+0.2
Rays 179 Nationals 289 -0.7
Phillies 202 White Sox 258 -0.1
Games Above .500
Chance Will Make Playoffs