Earned run average

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What Wikipedia says

In baseball statistics, earned run average (ERA) is the average of earned runs allowed by a pitcher per nine innings pitched (i.e. the traditional length of a game). It is determined by dividing the number of earned runs allowed by the number of innings pitched and multiplying by nine. Thus, a lower ERA is better.

Excerpt from the Wikipedia article “Earned run average”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Paul Thompson, Public domain, via Wikimedia Commons.