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

The mean of 9 observations is 16. One more observation is included and the new mean becomes 17. The 10th observation is :
[A]9
[B]16
[C]26
[D]30

26
Mean of ten observations – Mean if nine observations = Tenth observation
= 10 \times 17 – 16 \times 9
= 170 – 144 = 26
Hence option [C] is correct answer.

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