Group A contains 20 observations with a mean of 15, while Group B contains 30 observations with a mean of 25. What is the combined mean?
Correct answer: B. 21
- A. 20
- B. 21
- C. 22
- D. 24
Explanation
The combined total is (20 × 15) + (30 × 25) = 1,050, and the combined number of observations is 50. Dividing 1,050 by 50 gives a combined mean of 21.
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