Combined mean formula is essential when: MCQ with Answer and Explanation

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Combined mean formula is essential when:

A. Merging means from groups of different sizes

B. Calculating mode

C. Data is qualitative

D. All groups have the same size

Answer: Option A

Solution (By JKSSB Mock Tests)

Combined mean = (n₁x̄₁ + n₂x̄₂) / (n₁ + n₂) weights each group's mean by its size, providing the correct overall mean when aggregating subgroup statistics.

This question belongs to: Accountancy and Statistics Statistics

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Which method is most suitable when the field of investigation is vast and informants are educated?

A. Observation method

B. Direct interview

C. Mailed questionnaire

D. Schedule method

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Correct Answer: Option C

Explanation:
Mailed questionnaire can reach a large geographic area at low cost, provided respondents are literate.

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Question #2

The CPI for agricultural labourers (CPI-AL) is used to:

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B. Adjust wages of agricultural labourers

C. Calculate GDP

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Correct Answer: Option B

Explanation:
CPI-AL is primarily used to revise minimum wages for agricultural workers.

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Question #3

In a continuous frequency distribution, what does the term 'class mark' refer to?

A. The difference between upper and lower limits

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C. The midpoint of the class interval

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Correct Answer: Option C

Explanation:
The class mark is calculated as (Upper Limit + Lower Limit) / 2 and represents the entire class in calculations.

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