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 -9.5
-1.5
Red Sox 361 Indians 260 -1.5
-0.1
Pirates 247 Rays 191 -0.7
-0.1
Blue Jays 271 Brewers 305 +0.4
-0.1
White Sox 200 Americans 164 +0.4
-0.1
Tigers 310 Phillies 195 -0.3
+0.1
Week of 4/17100.0*Chance in playoffs100.0*Average seed
Indians 192 Nationals 281 +0.4
+1.3
Rays 194 Red Sox 226 -0.4
+0.1
Twins 232 Pirates 218 -0.2
-0.1
Phillies 225 Blue Jays 294 -0.1
+0.1
Americans 217 Tigers 230 +0.1
+0.1
Week of 4/24100.0*Chance in playoffs100.0*Average seed
Rays 179 Nationals 289 +1.3
Brewers 257 Americans 351 -0.5
Indians 266 Twins 250 +0.3
Phillies 202 White Sox 258 -0.3
Red Sox 236 Pirates 187 +0.2
Blue Jays 251 Tigers 123 -0.1
Games Above .500
Chance Will Make Playoffs