Definition – What is the “Average Run Rate Method” in Cricket?
The average run rate method was used to determine who wins a match that is interrupted by weather.
The method gives a target score for the team batting second. If the team batting second exceeds the target, they win the match. Otherwise, the team batting first wins the match.
The ARR method was used until 1991 when it was replaced by the Most Productive Overs method.
Formula – How to calculate the average run rate method
Team 2 Target = (Team 1 Runs x (Overs Available to Team 2 ÷ Overs Used by Team 1)) + 1
Sources and more resources
Wikipedia – Average Run Rate Method – Wikipedia entry on the ARR method.