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 -8.4
-0.9
White Sox 200 Americans 164 +0.3
Blue Jays 271 Brewers 305 +0.2
-0.1
Pirates 247 Rays 191 -0.2
Tigers 310 Phillies 195 +0.1
+0.1
Week of 4/17100.0*Chance in playoffs100.0*Average seed
Twins 232 Pirates 218 +0.1
-0.0
Indians 192 Nationals 281 Out
-1.3
Rays 194 Red Sox 226 +0.0
Brewers 298 White Sox 277 +0.0
Phillies 225 Blue Jays 294 +0.1
Americans 217 Tigers 230 +0.0
Week of 4/24100.0*Chance in playoffs100.0*Average seed
Indians 266 Twins 250 +1.2
Brewers 257 Americans 351 -0.3
Phillies 202 White Sox 258 +0.1
Games Above .500
Chance Will Make Playoffs