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

Question
The combined mean of two groups is 55, with n₁=40, mean₁=50. If n₂=60, mean₂ is:
A. 60
B. 58.33
C. 57.5
D. 59
Answer: Option B
Solution (By JKSSB Mock Tests)
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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