The harmonic mean is the reciprocal of the arithmetic mean of: MCQ with Answer and Explanation

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The harmonic mean is the reciprocal of the arithmetic mean of:

A. The observations themselves

B. Squares of observations

C. Square roots of observations

D. Reciprocals of the observations

Answer: Option D

Solution (By JKSSB Mock Tests)

HM = 1 / [ (1/n) Σ (1/x_i) ].

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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The base year of All India CPI (Combined) currently is:

A. 2011-12

B. 2012

C. 2016

D. 2010

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Correct Answer: Option B

Explanation:
The new series of CPI (Rural, Urban, Combined) has base year 2012.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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A speaks truth in 60% cases, B in 70% cases. They agree in a statement. The probability that the statement is true is:

A. 0.58

B. 0.78

C. 0.50

D. 0.42

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Correct Answer: Option B

Explanation:
Agreement can be both truth or both lie. P(both truth)=0.6×0.7=0.42; both lie=0.4×0.3=0.12. Total agreement=0.54. Probability truth given agreement = 0.42/0.54 ≈ 0.7778.

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Question #3

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The weights used in the construction of the Wholesale Price Index (WPI) in India are based on:

A. Retail consumption patterns

B. Number of employees in factories

C. Value of wholesale transactions (production + imports - exports)

D. Income tax slabs

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Correct Answer: Option C

Explanation:
WPI weights reflect the total value of commodities transacted in the domestic wholesale market.

This question belongs to: Accountancy and Statistics Statistics

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