Michigan http://football.stassen.com/cgi-bin/records/calc-wp.pl?start=1869&end=2007&rpct=30&min=1&se=on&by=Win+Pct
100
The San Antonio Spurs have the best winning percentage over the past 13 years out of the four major sports in the US.
The New Zealand rugby team, the All Blacks, have an all-time 74.49% winning percentage.
Yes
San Antonio spurs
About 75% of middle schooler would participate in school sports.
New England Patriots
cleveland indians
Which sport are you talking about. Hockey, Soccer, Basketball, Baseball, Football, Etc.......
Joe Retton career at Fairmont State: 478-95 which is a 83.6% winning percentage. He was featured in the Nov 30th 1981 issue of sports illustrated. He had 18 straight 20 win winning seasons. National coach of the year in 1969 and 1976.
Ratings Percentage IndexThe Rating Percentage Index (RPI) has been used by the NCAA since 1981 to supplement the selection of at-large teams and the seeding of all teams for the NCAA basketball tournament.Ratings percentage index
Schools have been introduced to sports for hundreds of years. The first sport was soccer that was introduced to British schools.