My working out:
Median = mean = 60
Q3 = 25% of values at 75
25% = 0.25 = z-score of 0.68
Sx = (75-60)/0.68 = 22.3881 approx = 20... I said D
The correct answer is B. 10
2026-03-31 20:49:23.1774990163
Standard Deviation Question
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