The mean of 50 observations was 36. It was found later that an observation 48 was wrongly taken as 47. The corrected new mean is? Choose the correct choice from the following answers:
A) 36.7
B) 36.1
C) 36.5
D) 36.02
E) 36.3

Rationale: "correct sum = ( 36 * 50 + 48 - 47 ) = 1801 . correct mean = 1801 / 50 = 36.02 answer : d"
Answer: D