The average of 6 observations is 12 A new seventh observation is included and the new average is dec...........

Quantitative Aptitude ( CCS) Average

The average of 6 observations is 12. A new seventh observation is included and the new average is decreased by 1. The seventh observation is

Total of 6 observations = 6×126×12 = 72
Total of 7 observations (including the 7th)
= 7×(12−1)=777×(12−1)=77
Therefore, 7th observation = 77 - 72 = 5

Hence, option 3 is the correct answer.

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