Q401
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
AnswerC.
32
D.
45
Answer: Option B
Solution
Answer: Option B
Solution:
Difference = 81 - 18 = 63So, change in average = = + 7
Correct average = 35 + 7 = 42