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The mean score on Mrs. Adam's statistics test was 68.5 and the standard deviation was 15.4. The distribution of scores was distinctly skewed to the

The mean score on Mrs. Adam's statistics test was 68.5 and the standard deviation was 15.4. The distribution of scores was distinctly skewed to the left. Sheila's test score was 58. Calculate Sheila's z-score. z= _______.

(Enter NA if it is not appropriate to calculate a z-score for a distribution that is non-Normal.)

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