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

A. 9

B. 16

C. 26

D. 30

Answer: Option C

Solution(By Examveda Team)

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
∴ 10^th observation = 170 - 144 = 26