Win% represents the percent games played that were won.
Games Won + ( Games Tied × 0.5 ) ) ÷ Games Played = Win%
( 4 + ( 1 × 0.5 ) ) ÷ 12 = 37.5%
SOS1 represents the average of opponents' Win% for each game.
AVERAGE(
) = 0.467
SOS2 represents the average of opponents' SOS1.
AVERAGE(
) = 0.440
RPI represents the Ratings Percentage Index
( 40% × Win% ) + ( 40% × SOS1 ) + ( 20% × SOS2 ) = RPI
( 40% × 0.375 ) + ( 40% × 0.467 + ( 20% × 0.440 ) = 0.425
( 0.150 ) + ( 0.187 ) + ( 0.088 ) = 0.425