The harmonic mean is most appropriate for: MCQ with Answer and Explanation

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The harmonic mean is most appropriate for:

A. Average price

B. Average growth rate

C. Average height

D. Average speed when distance is fixed

Answer: Option D

Solution (By JKSSB Mock Tests)

HM is used for rates when the numerator is constant.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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A box has 2 red, 3 blue, 5 green balls. Probability of drawing a green ball is:

A. 3/10

B. 1/2

C. 2/5

D. 5/10

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Correct Answer: Option D

Explanation:
Total balls = 10, green = 5, probability = 5/10 = 1/2. But option B says 5/10, which is the same. So B is correct.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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If a population has a crude birth rate of 30 and crude death rate of 10 per 1000, the natural increase rate (per 1000) is:

A. 20

B. 2

C. 40

D. 3

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Correct Answer: Option A

Explanation:
Rate of natural increase = CBR - CDR = 30 - 10 = 20 per 1000.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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Which of the following statements about secondary data is NOT correct?

A. It is already collected data that may be used by another researcher.

B. It is always tailored to the researcher's specific objective.

C. It is often less expensive to obtain than primary data.

D. It can be obtained from published reports.

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Correct Answer: Option B

Explanation:
Secondary data was collected for another purpose, so it may not fit the current research objective perfectly; it is not always tailored.

This question belongs to: Accountancy and Statistics Statistics

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