The mean of 9 observation 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 Answer: Option CShow Answer
Solution(By Apex 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
∴ 10th observation = 170 – 144 = 26
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