Q. The mean of 20 observations is 19. One more observation is included and the new mean becomes 20. The 21st observation is
A) 30
B) 20
C) 42
D) 40
✔ Correct Answer: 40
Exam Insight
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A) 30
B) 20
C) 42
D) 40
✔ Correct Answer: 40
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