The mean of 50 observations was 36. It was found later that an observation 29 was wrongly taken as 23. The corrected new mean is : Choose the correct choice from the following answers.
A) 36.1
B) 36.5
C) 36.22
D) 36.12
E) 36.18

Rationale: "explanation : correct sum = ( 36 * 50 + 29 - 23 ) = 1806 . correct mean = = 1806 / 50 = 36.12 answer : d ) 36.12"
Answer: D