The ERA (earned run average) for Tanner Roark of Washington Nationals, who pitched 18 innings during spring training in year 2016 and gave up 4 earned runs.

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Chapter 14.1, Problem 2CP

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To calculate: The ERA (earned run average) for Tanner Roark of Washington Nationals, who pitched 18 innings during spring training in year 2016 and gave up 4 earned runs.

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