Quantitative Aptitude Ques 1651

Question: The average of six observations is 12. The average decreases by 1, when a new observation is included. What is the seventh observation? [SBI (P0)2015]

Options:

A) 1

B) 3

C) 5

D) 6

E) None of these

Show Answer

Answer:

Correct Answer: C

Solution:

  • Total of 6 observations $ =6\times 12=72 $ Total of 7 observations (including the 7th) $ =7\times (12-1)=77 $

$ \therefore $ 7th observations $ =77-72=5 $

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