The harmonic mean of 4 and 12 is: MCQ with Answer and Explanation

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The harmonic mean of 4 and 12 is:

A. 16

B. 6

C. 3

D. 8

Answer: Option B

Solution (By JKSSB Mock Tests)

HM = 2 / (1/4 + 1/12) = 2 / (4/12) = 2 / (1/3) = 6.

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

Question #1

Which of the following is not a vital event?

A. Marriage

B. Death

C. Graduation

D. Birth

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Correct Answer: Option C

Explanation:
Vital events refer to births, deaths, marriages, and divorces.

This question belongs to: Accountancy and Statistics Statistics

Question #2

If the Arithmetic Mean (AM) of two positive numbers is 10 and their Geometric Mean (GM) is 8, what is their Harmonic Mean (HM)?

A. 8.5

B. 6.4

C. 7.2

D. 9.0

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Correct Answer: Option B

Explanation:
For two positive numbers, AM × HM = GM². Therefore, 10 × HM = 64, which gives HM = 6.4.

This question belongs to: Accountancy and Statistics Statistics

Question #3

Which of the following is NOT a component of population change?

A. Mortality

B. Fertility

C. Migration

D. Inflation

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Correct Answer: Option D

Explanation:
Population change results from births, deaths, and migration; inflation is an economic concept.

This question belongs to: Accountancy and Statistics Statistics

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