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 -16.8
-1.8
Red Sox 361 Indians 260 -1.3
Blue Jays 271 Brewers 305 +1.1
-0.0
White Sox 200 Americans 164 +0.9
Pirates 247 Rays 191 -0.2
Nationals 169 Twins 250 -0.2
Week of 4/17100.0*Chance in playoffs100.0*Average seed
Phillies 225 Blue Jays 294 -9.3
-1.8
Brewers 298 White Sox 277 -2.7
-0.1
Americans 217 Tigers 230 -0.7
+0.2
Twins 232 Pirates 218 -0.3
-0.1
Rays 194 Red Sox 226 -0.1
+0.1
Indians 192 Nationals 281 +0.0
Week of 4/24100.0*Chance in playoffs100.0*Average seed
Phillies 202 White Sox 258 -1.5
Brewers 257 Americans 351 -0.3
Indians 266 Twins 250 -0.2
Rays 179 Nationals 289 +0.0
Games Above .500
Chance Will Make Playoffs