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 -17.3
-1.4
White Sox 200 Americans 164 +4.3
+0.3
Pirates 247 Rays 191 -1.4
-0.0
Tigers 310 Phillies 195 -1.0
-0.0
Nationals 169 Twins 250 -0.1
-0.0
Red Sox 361 Indians 260 -0.0
Week of 4/17100.0*Chance in playoffs100.0*Average seed
Phillies 225 Blue Jays 294 +2.5
+0.7
Rays 194 Red Sox 226 +1.0
+0.1
Brewers 298 White Sox 277 -0.9
-0.1
Americans 217 Tigers 230 +0.8
+0.2
Twins 232 Pirates 218 -0.7
-0.4
Indians 192 Nationals 281 -0.0
Week of 4/24100.0*Chance in playoffs100.0*Average seed
Blue Jays 251 Tigers 123 +54.2
+2.5
Indians 266 Twins 250 +8.3
+0.1
Brewers 257 Americans 351 +3.8
-0.1
Red Sox 236 Pirates 187 +3.4
+0.1
Rays 179 Nationals 289 -1.2
+0.2
Phillies 202 White Sox 258 +0.2
+0.1
Games Above .500
Chance Will Make Playoffs