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To get the arithmetic mean, sum them up and divide by the count (in this case 10). So we have 12 + 14 + 15 + 16 + 18 + 20 + 21 + 22 + 24 + 25 = 187. Divide by 10 is 18.7

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11y ago
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Q: What is the arithmetic mean of the first nine composite numbers that are greater than 10?
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