The combined mean of two groups with n₁=20, mean₁=50 and n₂=30, mean₂=60 is: MCQ with Answer and Explanation

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The combined mean of two groups with n₁=20, mean₁=50 and n₂=30, mean₂=60 is:

A. 57

B. 55

C. 54

D. 56

Answer: Option D

Solution (By JKExamLibrary)

Combined mean = (20×50 + 30×60) / (20+30) = (1000+1800)/50 = 2800/50 = 56.

This question belongs to: Accountancy and Statistics Statistics

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In a study on urban migration patterns, a researcher uses data from the National Sample Survey Office (NSSO) reports. This data is classified as:

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C. Primary data

D. Secondary data

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Correct Answer: Option D

Explanation:
Data obtained from published reports like NSSO is secondary data because it was collected by another agency for a different purpose and is being reused by the researcher.

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C. A is false but R is true

D. Both A and R are true and R is the correct explanation

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Correct Answer: Option D

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Correct Answer: Option B

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