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

The mean of 9 observation is 16. One more observation is included and the new mean becomes 17. The 10th observation is : Correct Answer 26

According to the question mean of 9 observations is = 16
Sum of all observations is = 16 × 9 = 144
When one more observation included the new mean = 17
Sum of 10 observations = 10 × 17 = 170
∴ 10th observation = 170 - 144 = 26

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