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On a recent quiz, the class mean was 70 with a standard deviation of 4.5. Calculate the z-score (to 4 decimal places) for a person

On a recent quiz, the class mean was 70 with a standard deviation of 4.5. Calculate the z-score (to 4 decimal places) for a person who received score of 67.75. Z-score: Is this unusual? O Not Unusual O Unusual

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