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Which mean, standard deviation, and x-value set corresponds to a z-score of 2? a.) x-value = 80 O mean = 100 standard deviation = 10 b.) x-value = 18 O mean = 25 standard deviation = 7 c.) x-value = 70 O mean = 60 standard deviation = 5 d.) x-value = 68 O mean = 60 standard deviation = 8