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Batting average is hits divided by at bats (hits + outs + reached on error).

ERA is earned runs divided by innings pitched, then multiplied by nine (in other words, the average number of earned runs given up over nine innings).

For more info: Baseball-almanac

reaching on error counts as an out so. Remember BB(walks), sac bunts, sac flies and HPB do not count as plate appearences.

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Q: How do you determine percentages in stats such as batting average and ERA?
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