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
Nationals 169 Twins 250 -2.4
-1.3
Pirates 247 Rays 191 -0.3
-0.1
Red Sox 361 Indians 260 -0.2
White Sox 200 Americans 164 +0.1
Blue Jays 271 Brewers 305 +0.1
-0.2
Tigers 310 Phillies 195 +0.1
Week of 4/17100.0*Chance in playoffs100.0*Average seed
Indians 192 Nationals 281 +1.3
Americans 217 Tigers 230 +0.0
Phillies 225 Blue Jays 294 +0.1
Week of 4/24100.0*Chance in playoffs100.0*Average seed
Rays 179 Nationals 289 +1.6
Brewers 257 Americans 351 -0.6
Indians 266 Twins 250 +0.1
Red Sox 236 Pirates 187 +0.0
Phillies 202 White Sox 258 +0.0
Games Above .500
Chance Will Make Playoffs