Weighted mean is used when: MCQ with Answer and Explanation

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Weighted mean is used when:

A. Distribution is symmetric

B. Data are qualitative

C. Different observations have different importance

D. All observations are equal

Answer: Option C

Solution (By JKSSB Mock Tests)

Weighted mean assigns weights to reflect the varying importance of items.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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Harmonic mean is undefined if:

A. Any observation is zero

B. Data are continuous

C. All observations are positive

D. Data are discrete

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Correct Answer: Option A

Explanation:
Reciprocals of zero are infinite, making HM undefined.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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A questionnaire that allows the respondent to write answers in his own words contains:

A. Open-ended questions

B. Closed-ended questions

C. Multiple choice questions

D. Ranking questions

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Correct Answer: Option A

Explanation:
Open-ended questions allow free expression without predefined options.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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The total fertility rate (TFR) in India as per NFHS-5 is approximately:

A. 2.0

B. 3.0

C. 2.7

D. 2.2

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Correct Answer: Option A

Explanation:
TFR declined to around 2.0 (replacement level).

This question belongs to: Accountancy and Statistics Statistics

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