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a standard exam’s score are normally distributed. in recent yearthe mean test score was 21.2 and...

a standard exam’s score are normally distributed. in recent yearthe mean test score was 21.2 and the standard deviation was 5.4 . the test score of four students selected at random are 15, 23, 9, 34. find the z score that correspond to each value and determine whether any of the values are unusual. the z score for 15 is ?
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