The average of 10 observations is 46. It was realised later than an observation was misread as 42 in place of 142. The correct average is:
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 56
Sum of all the observations = 460
The correct sum will be = 460 - 42 + 142 = 560
The correct average = 560/10 = 56