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. 8

B. 16

C. 6

D. 3

Answer: Option C

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

The Fisher index is also known as:

A. Cost index

B. Ideal index

C. Chain index

D. Simple index

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Correct Answer: Option B

Explanation:
Fisher termed his index 'ideal' because it satisfies time reversal and factor reversal tests.

This question belongs to: Accountancy and Statistics Statistics

Question #2

The arithmetic mean of 5 numbers is 20. If one number is excluded, the mean of the remaining 4 numbers becomes 18. The excluded number is:

A. 28

B. 20

C. 22

D. 30

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Correct Answer: Option A

Explanation:
Sum of 5 numbers = 5 × 20 = 100. Sum of 4 numbers = 4 × 18 = 72. Excluded number = 100 - 72 = 28.

This question belongs to: Accountancy and Statistics Statistics

Question #3

The geometric mean is preferred for averaging:

A. Test scores

B. Percentage growth rates

C. Temperatures

D. Heights of students

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Correct Answer: Option B

Explanation:
Geometric mean is suitable for averaging ratios and rates of change over time.

This question belongs to: Accountancy and Statistics Statistics

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