Statisticshard · Past Paper
The median of a continuous series is 30. The median class is 20-40, frequency of median class is 10, CF of preceding class is 5, and class width is 20. Find N.
A10
B20
C30
D40
✓ Correct Answer: B — 20
30 = 20 + [(N/2 - 5)/10] * 20 => 10 = (N/2 - 5) * 2 => 5 = N/2 - 5 => 10 = N/2 => N = 20.
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