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Eduncle Best Answer
Z = X – M/SD
X = 48; M = 60; SD = 12
Z = 48-60/12 = –1
Percentile rank at –1Z = 16%
Percentage of cases falling above the score 48 = 100 – 16 = 84%
Number of cases falling above the score 48 = 300*84% = 252