Homework Answers
Mean = 80.5
SD = 9.9
Z = (X - mean) / SD
Or, x = 80.5 + z * 9.9
A) z score for 30th percentile = Z0.7 = -0.52
X = 80.5 - 0.52 * 9.9 = 75.35
B) z score for 67th percentile = Z0.33 = 0.44
X = 80.5 + 0.44 * 9.9 = 84.86
C) z score for 3rd quartile = Z0.25 = 0.67
X = 80.5 + 0.67 * 9.9 = 87.13
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