Win% represents the percent games played that were won.
Games Won + ( Games Tied × 0.5 ) ) ÷ Games Played = Win%
( 4 + ( 0 × 0.5 ) ) ÷ 15 = 26.7%
SOS1 represents the average of opponents' Win% for each game.
AVERAGE(
) = 0.472
SOS2 represents the average of opponents' SOS1.
AVERAGE(
) = 0.457
RPI represents the Ratings Percentage Index
( 40% × Win% ) + ( 40% × SOS1 ) + ( 20% × SOS2 ) = RPI
( 40% × 0.267 ) + ( 40% × 0.472 + ( 20% × 0.457 ) = 0.387
( 0.107 ) + ( 0.189 ) + ( 0.091 ) = 0.387