It is a measure to judge how effective a pitcher is. It calculated by taking the total earned runs a pitcher has allowed and dividing by (total #of innings pitched/9). Giving you an average number of runs a pitcher allows (earned runs) every 9 innings
A hurler is a slang term for a pitcher in baseball. ERA stands for Earned Run Average and is a statistic for pitchers that shows the number of 'earned' runs a pitcher allows for every nine innings. An earned run is a run that is scored without the help of an error or passed ball. One might think that the earned run average of a pitcher is similar to that of the batting average of a hitter.
Earned runs are runs that are scored because of hits stolen bases. Un-earned runs are those where a runner gets on base because of an error and eventually scores. The earned run average (ERA) is calculated by taking the total number of earned runs scored against a pitcher and dividing that by the total number of innings that pitcher pitched. The lower the ERA the better the pitcher, usually.
An earned run is a run that the pitcher is held responsible for so if the pitcher gives up a home run that 1 earned run you probably already knew that. Instead if the pitcher pitches and then the ball is hit into the outfield and a outfielder drops it and a run comes in that would not be an earned run.
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