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
Red Sox 361 Indians 260 +10.0
+0.7
White Sox 200 Americans 164 +0.8
+0.1
Blue Jays 271 Brewers 305 +0.6
+0.0
Nationals 169 Twins 250 -0.5
-0.1
Pirates 247 Rays 191 -0.4
Week of 4/17100.0*Chance in playoffs100.0*Average seed
Twins 232 Pirates 218 -5.6
-0.4
Rays 194 Red Sox 226 +5.1
+0.6
Phillies 225 Blue Jays 294 -0.4
Brewers 298 White Sox 277 -0.2
-0.0
Americans 217 Tigers 230 -0.0
Week of 4/24100.0*Chance in playoffs100.0*Average seed
Blue Jays 251 Tigers 123 -6.4
+0.3
Red Sox 236 Pirates 187 In
+0.5
Indians 266 Twins 250 +0.9
+0.4
Brewers 257 Americans 351 +0.9
+0.3
Games Above .500
Chance Will Make Playoffs