The combined mean of two groups is 55, with n₁=40, mean₁=50. If n₂=60, mean₂ is: MCQ with Answer and Explanation

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The combined mean of two groups is 55, with n₁=40, mean₁=50. If n₂=60, mean₂ is:

A. 57.5

B. 59

C. 60

D. 58.33

Answer: Option D

Solution (By JKExamLibrary)

55 = (40×50 + 60×x) / 100 → 2000 + 60x = 5500 → 60x = 3500 → x = 58.33.

This question belongs to: Accountancy and Statistics Statistics

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