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

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Harmonic mean is the reciprocal of the arithmetic mean of:

A. Logarithms of observations

B. Squares of observations

C. Observations themselves

D. Reciprocals of 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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Life expectancy at birth is calculated from a:

A. Census

B. Fertility survey

C. Sample survey

D. Life table

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Correct Answer: Option D

Explanation:
Life expectancy is derived from a life table, which summarizes mortality rates at each age.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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Age-specific fertility rate for age group 25-29 is 120 per 1000 women. If there are 15,000 women in this age group, the expected number of births to them is:

A. 2000

B. 1800

C. 1200

D. 1500

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Correct Answer: Option B

Explanation:
Births = ASFR × (number of women) / 1000 = 120 × 15000 / 1000 = 1800.

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Question #3

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The infant mortality rate in Kerala is lower than in Madhya Pradesh primarily due to:

A. Better healthcare and higher female literacy

B. Higher fertility

C. Larger population

D. Higher income

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Correct Answer: Option A

Explanation:
Kerala's good health infrastructure and high literacy contribute to low IMR.

This question belongs to: Accountancy and Statistics Statistics

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