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
Tigers 310 Phillies 195 -10.7
-1.5
White Sox 200 Americans 164 +1.1
+0.1
Blue Jays 271 Brewers 305 -0.4
-0.1
Red Sox 361 Indians 260 -0.4
+0.1
Week of 4/17100.0*Chance in playoffs100.0*Average seed
Phillies 225 Blue Jays 294 -1.8
-1.4
Brewers 298 White Sox 277 -1.7
+0.0
Americans 217 Tigers 230 +0.4
+0.1
Twins 232 Pirates 218 -0.2
-0.1
Rays 194 Red Sox 226 +0.2
+0.1
Indians 192 Nationals 281 +0.1
-0.0
Week of 4/24100.0*Chance in playoffs100.0*Average seed
Phillies 202 White Sox 258 -1.3
Indians 266 Twins 250 -0.2
Rays 179 Nationals 289 +0.1
Games Above .500
Chance Will Make Playoffs