Question : The mean of 9 observations is 16. When one more observation is included, the new mean becomes 17. What is the value of the 10th observation?
Option 1: 9
Option 2: 16
Option 3: 26
Option 4: 30
Correct Answer: 26
Solution : Given: The mean of 9 observations is 16. One more observation is included and the new mean after becomes 17. Tenth observation = sum of ten observations – sum of nine observations = (17 × 10) – (16 × 9) = 170 – 144 = 26 Hence, the correct answer is 26.
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