The mean of 30 given numbers, when it is given that the mean of 10 of them is 12 and the mean of the remaining 20 is 9, is equal to
- A. $11$
- B. $10$
- C. $9$
- D. $5$
✅ Correct Answer: $10$
Explanation
The overall mean is calculated using $\frac{10 \times 12 + 20 \times 9}{30}$ which simplifies to $10$.
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