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
Pirates 247 Rays 191 +26.8
+1.8
Blue Jays 271 Brewers 305 +2.4
+0.0
Tigers 310 Phillies 195 -1.1
-0.0
Red Sox 361 Indians 260 -1.0
+0.0
White Sox 200 Americans 164 +0.8
Nationals 169 Twins 250 -0.1
+0.1
Week of 4/17100.0*Chance in playoffs100.0*Average seed
Twins 232 Pirates 218 -26.2
-1.6
Americans 217 Tigers 230 +3.4
+0.0
Brewers 298 White Sox 277 +3.2
+0.0
Rays 194 Red Sox 226 -0.6
Phillies 225 Blue Jays 294 -0.4
-0.0
Week of 4/24100.0*Chance in playoffs100.0*Average seed
Red Sox 236 Pirates 187 -16.9
-0.7
Blue Jays 251 Tigers 123 -15.5
-0.3
Brewers 257 Americans 351 +10.2
+0.1
Rays 179 Nationals 289 -9.7
-1.3
Indians 266 Twins 250 +2.5
+0.1
Phillies 202 White Sox 258 +1.8
-0.0
Games Above .500
Chance Will Make Playoffs