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 +3.3
+1.3
Pirates 247 Rays 191 +0.7
Red Sox 361 Indians 260 -0.3
-0.0
White Sox 200 Americans 164 +0.2
Blue Jays 271 Brewers 305 +0.1
-0.1
Tigers 310 Phillies 195 +0.1
Week of 4/17100.0*Chance in playoffs100.0*Average seed
Twins 232 Pirates 218 +37.0
+2.7
Rays 194 Red Sox 226 +1.0
+0.0
Brewers 298 White Sox 277 -0.1
+0.1
Phillies 225 Blue Jays 294 -0.1
-0.1
Indians 192 Nationals 281 +0.1
+0.1
Americans 217 Tigers 230 +0.0
Week of 4/24100.0*Chance in playoffs100.0*Average seed
Indians 266 Twins 250 -34.5
-1.4
Blue Jays 251 Tigers 123 -34.1
-0.5
Brewers 257 Americans 351 +16.8
+0.6
Rays 179 Nationals 289 +2.8
+0.1
Red Sox 236 Pirates 187 -2.3
-0.3
Phillies 202 White Sox 258 -0.5
Games Above .500
Chance Will Make Playoffs