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

Question Report Error

The harmonic mean of 4 and 12 is:

A. 8

B. 6

C. 3

D. 16

Answer: Option B

Solution (By JKExamLibrary)

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 Report Error

The arithmetic mean of 10, 20, 30, 40, 50 is:

A. 40

B. 25

C. 35

D. 30

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Correct Answer: Option D

Explanation:
Sum = 150, number = 5, mean = 150/5 = 30.

This question belongs to: Accountancy and Statistics Statistics

Question #2 Report Error

Which of the following is a source of primary data?

A. Census data

B. Data from an experiment designed by the investigator

C. Journal article

D. Annual report of RBI

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Correct Answer: Option B

Explanation:
Data generated from one's own experiment is primary data; the others are secondary sources.

This question belongs to: Accountancy and Statistics Statistics

Question #3 Report Error

If in a moderately skewed distribution mean = 30 and median = 28, the empirical mode is approximately:

A. 24

B. 32

C. 22

D. 26

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Correct Answer: Option A

Explanation:
Using the empirical relation: Mode ≈ 3Median - 2Mean = 3×28 - 2×30 = 84 - 60 = 24.

This question belongs to: Accountancy and Statistics Statistics

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