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A standardized exam's scores are normally distributed. In a recent year, the mean test score was
21.2 and the standard deviation was 5.5. The test scores of four students selected at random are
15, 24, 7, and 36 . Find the z -scores that correspond to each value and determine whether any of
the values are unusual. The z-score for 15 is (Round to two decimal places as needed.)

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  • 1. A standardized exam's scores are normally distributed. In a recent year, the mean test score was 21.2 and the standard deviation was 5.5. The test scores of four students selected at random are 15, 24, 7, and 36 . Find the z -scores that correspond to each value and determine whether any of the values are unusual. The z-score for 15 is (Round to two decimal places as needed.)