The combined mean of two groups with means 40 (size 10) and 60 (size 20) is: MCQ with Answer and Explanation

The combined mean of two groups with means 40 (size 10) and 60 (size 20) is:

A. 56.67

B. 50

C. 53.33

D. 55

Answer: Option C

Solution (By JKExamLibrary)

Combined mean = (10×40 + 20×60) / (10+20) = (400 + 1200) / 30 = 1600 / 30 ≈ 53.33. This weights each group's mean by its sample size.

This question belongs to: Accountancy and Statistics Statistics

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