Statisticshard · Past Paper
If the lower quartile Q1 is 20 and the upper quartile Q3 is 60, what is the value of the semi-interquartile range?
A40
B20
C80
D30
✓ Correct Answer: B — 20
Semi-interquartile range (Quartile Deviation) = (Q3 - Q1) / 2 = (60 - 20) / 2 = 20.
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