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The mean of 9 observations is 16. One more observation is included and the new mean becomes 17. The 10th observation is:

1. 9
2. 16
3. 26
4. 30

Correct answer: 26

Solution

The sum of 9 observations is 9 × 16 = 144. The sum of 10 observations is 10 × 17 = 170, so the 10th observation is 170 - 144 = 26.

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