The harmonic mean of 1, 2, and 4 is: MCQ with Answer and Explanation

The harmonic mean of 1, 2, and 4 is:

A. 12/7

B. 7/12

C. 3/7

D. 7/3

Answer: Option A

HM = 3 / (1 + 1/2 + 1/4) = 3 / 1.75 = 12/7.

This question belongs to: Accountancy and Statistics Statistics

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Question #1 Report Error

If each value in a dataset is increased by 10, which of the following measures remains unchanged?

A. First quartile

B. Median

C. Range

D. Mean

Correct Answer: Option C

Explanation:
Range depends on difference between max and min; both increase by 10, so range unchanged.

This question belongs to: Accountancy and Statistics Statistics

Question #2 Report Error

Which of the following is a principle of questionnaire design?

A. Use ambiguous terms

B. Ask personal questions at the beginning

C. Maintain a logical flow from general to specific

D. Use double negatives

Correct Answer: Option C

Explanation:
Logical sequencing improves response quality and reduces dropout.

This question belongs to: Accountancy and Statistics Statistics

Question #3 Report Error

In the theory of attributes, the total number of ultimate class frequencies for 'n' attributes is:

A. n^2

B. 3^n

C. n!

D. 2^n

Correct Answer: Option D

Explanation:
For n attributes, each can be either present or absent, resulting in 2^n ultimate class frequencies.

This question belongs to: Accountancy and Statistics Statistics