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Twenty people report their monthly salary. 5 people each make $3500, 8 people each make $4000,...

Twenty people report their monthly salary. 5 people each make $3500, 8 people each make $4000, 5 people each make $4200 and 2 people each make $4300. Person A from this group makes $4200. What is the z-score for Person A’s monthly salary?

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