Q. The average of 6 observation is 12. A new 7th observation is included and the new average is decrease by 1 , the seventh observation is ?
✅ Correct Answer: (C)
5
Explanation: Seventh observation = sum of 7 observations - sum of 6 observations = 7 x 11 – 6 x 12
= 5
= 5
Explanation by: Ruchi Sharma
Seventh observation = sum of 7 observations - sum of 6 observations = 7 x 11 – 6 x 12
= 5
= 5