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Interpretation of standard z- scores using the given data.

Lewis earned 85 on his biology midterm and 81 on his history midterm. In the biology class the mean score was 79 with standard deviation 5. In history class the mean score was 76 with standard deviation 3.

a) Convert each midterm score to a standard z score.

b) On which test did he do better compared to the rest of the class?

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