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Kaitlyn scored 84 in the class with the mean 72.2 and the standard deviation5.4, but Naomi scored 73 in the class with the mean 52.9

Kaitlyn scored 84 in the class with the mean 72.2 and the standard deviation5.4, but Naomi scored 73 in the class with the mean 52.9 and the standard deviation 9.4. Who scored relatively better.

Kaitlyns z-score is

and Naomis z-score is

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