What is the arithmetic mean of the first ten composite numbers?
- A. 8.5
- B. 9.5
- C. 10.2
- D. 11.2 ✓
Correct Answer: D. 11.2
Explanation
The first ten composite numbers are 4, 6, 8, 9, 10, 12, 14, 15, 16, 18. Their sum is 112. The arithmetic mean is \frac{112}{10} = 11.2.
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