A frequency distribution has classes 0-10, 10-20, 20-30, 30-40. The median class is 20-30 and the cumulative frequency before this class is 30. If N=80, frequency of median class is 20. The median is: MCQ with Answer and Explanation
A frequency distribution has classes 0-10, 10-20, 20-30, 30-40. The median class is 20-30 and the cumulative frequency before this class is 30. If N=80, frequency of median class is 20. The median is:
A. 23
B. 26
C. 25
D. 24
Answer: Option C
Solution (By JKSSB Mock Tests)
Median = L + (N/2 - cf)/f × h = 20 + (40-30)/20 × 10 = 20 + 10/20×10 = 20 + 5 = 25.
Explanation:
Yule's Q = [(AB)(αβ) - (Aβ)(αB)] / [(AB)(αβ) + (Aβ)(αB)], requiring the four cell frequencies of a 2×2 table cross-classifying two dichotomous attributes.
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