Which average is most appropriate for averaging ratios and rates when the denominators are variable? MCQ with Answer and Explanation

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Which average is most appropriate for averaging ratios and rates when the denominators are variable?

A. Median

B. Arithmetic mean

C. Weighted arithmetic mean

D. Harmonic mean

Answer: Option C

Solution (By JKSSB Mock Tests)

When denominators vary, a weighted mean using denominators as weights is appropriate.

This question belongs to: Accountancy and Statistics Statistics

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Two dice are rolled. The probability of getting a doublet is:

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B. 1/12

C. 1/3

D. 1/6

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Correct Answer: Option D

Explanation:
Doublets are (1,1), (2,2), (3,3), (4,4), (5,5), (6,6). Total 6 outcomes out of 36. Prob = 6/36 = 1/6.

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Question #2

Yule's coefficient of association (Q) ranges between:

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Correct Answer: Option A

Explanation:
Q = (ad - bc) / (ad + bc) lies between -1 and +1.

This question belongs to: Accountancy and Statistics Statistics

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Correct Answer: Option A

Explanation:
Lx is the number of person-years lived in the age interval.

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