Baseball Definitions Era
August 3rd, 2004 | 
Author: Baseball Bob
Author: Baseball Bob
baseball ?
What is the definition of a pichers ERA ?
In baseball statistics, earned run average (ERA) is the mean of earned runs given up by a pitcher per nine innings pitched. It is determined by multiplying the number of earned runs allowed by nine and dividing by the number of innings pitched. Runners reaching base on errors (even errors by pitchers) do not count toward ERA if they later score.
(HD)* MLB 10 The Show – Joe Mauer at bat