| 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] |
A) 1
B) 3
C) 5
D) 6
E) None of these
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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