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
White Sox 200 Americans 164 +7.7
+1.5
Blue Jays 271 Brewers 305 +1.4
+0.1
Tigers 310 Phillies 195 -0.5
Pirates 247 Rays 191 -0.3
Red Sox 361 Indians 260 +0.1
Week of 4/17100.0*Chance in playoffs100.0*Average seed
Brewers 298 White Sox 277 -23.3
-1.5
Rays 194 Red Sox 226 +6.3
+0.2
Twins 232 Pirates 218 -3.7
-0.3
Phillies 225 Blue Jays 294 -0.5
-0.1
Americans 217 Tigers 230 -0.4
-0.0
Indians 192 Nationals 281 +0.0
Week of 4/24100.0*Chance in playoffs100.0*Average seed
Rays 179 Nationals 289 +0.7
Phillies 202 White Sox 258 +0.3
Brewers 257 Americans 351 -0.1
Indians 266 Twins 250 -0.1
Red Sox 236 Pirates 187 +0.0
Games Above .500
Chance Will Make Playoffs