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
Blue Jays 271 Brewers 305 +7.5
+1.6
White Sox 200 Americans 164 +0.5
-0.1
Tigers 310 Phillies 195 -0.3
+0.1
Pirates 247 Rays 191 -0.2
-0.0
Red Sox 361 Indians 260 +0.1
Week of 4/17100.0*Chance in playoffs100.0*Average seed
Brewers 298 White Sox 277 +11.5
+1.6
Rays 194 Red Sox 226 +3.2
+0.1
Americans 217 Tigers 230 +1.7
+0.0
Twins 232 Pirates 218 -1.3
-0.2
Phillies 225 Blue Jays 294 +0.3
Indians 192 Nationals 281 -0.0
Week of 4/24100.0*Chance in playoffs100.0*Average seed
Brewers 257 Americans 351 -26.3
-0.8
Indians 266 Twins 250 +12.9
+0.4
Red Sox 236 Pirates 187 +9.3
+0.2
Rays 179 Nationals 289 +8.7
+0.2
Blue Jays 251 Tigers 123 -7.0
-0.3
Phillies 202 White Sox 258 +0.8
+0.1
Games Above .500
Chance Will Make Playoffs