What is Earned run average?
In [[baseball]], '''earned run average''' ([[wikt:abbreviated|abbreviated]] to '''ERA''') is the [[mean (statistics)|mean]] of [[earned run]]s given up by a [[pitcher (baseball)|pitcher]]. It is measured per nine [[innings pitched]] in [[Major League Baseball]]. ERA is found by dividing the number of earned runs allowed by the number of innings pitched and multiplying by nine. For example, if a pitcher allowed 25 runs during 95 innings pitched, his ERA would be 25 / 95 x 9, or 2.37. {{sport-stub}} [[Category:Baseball statistics]]