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Mathematics, 14.06.2020 05:57 janetshirinyan

One year Ron had the lowest ERA (earned-run average, mean number of runs yielded per nine innings pitched) of any male pitcher at his school, with an ERA of 3.06. Also, Karla had the lowest ERA of any female pitcher at the

school with an ERA of 3.28. For the males, the mean ERA was 5.086 and the standard deviation was 0.998. For

the females, the mean ERA was 4.316 and the standard deviation was 0.558. Find their respective Z-scores.

Which player had the better year relative to their peers, Ron or Karla? (Note: In general, the lower the ERA, the

better the pitcher.)

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