The average of 9 observations was found to be 35. Later on, it was detected that an observation 81 was misread as 18. The correct average of the observation is -
A. 28
B. 42
C. 32
D. 45
Answer: Option B
Solution (By Examveda Team)
Difference = 81 - 18 = 63So, change in average = $$\frac{+ 63}{9}$$ = + 7
Correct average = 35 + 7 = 42
This Question Belongs to Arithmetic Ability >> Average
9*35=315
315=(81-18/9)
315+63=378
378÷9=42
The correct answer is 42💪