The mean of 50 observations was 36. It was found later that an observation 48 was wrongly taken as 21. The corrected new mean is :	Pick.
A) 36.54  B) 36.58  C) 36.23  D) 36.14  E) 36.81

Rationale: "explanation : correct sum = ( 36 * 50 + 48 - 21 ) = 1827 . correct mean = = 1827 / 50 = 36.54 answer : a ) 36.54"
Answer: A