The Average Run Rate (ARR) method was a mathematical formulation designed to calculate the target score for the team batting second in a limited overs cricket match interrupted by weather or other circumstances. Often matches interrupted by weather would use reserve days, bowl outs, or be replayed on another date, but if logistics did not allow these, the ARR method would be used.
The ARR method was used from the start of one-day cricket in the 1950s and 1960s until it was replaced by the Most Productive Overs method in 1991.[1]
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