Statisticshard · Past Paper
Find the missing frequency f for the class 20-30 if the median is 25, N=60, cf=20, and class interval size is 10.
A10
B20
C30
D40
✓ Correct Answer: B — 20
Median = L + [(N/2 - cf)/f]*i => 25 = 20 + [(30 - 20)/f]*10 => 5 = 100/f => f = 20.
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