The mean of 50 observations was 36. It was found later that an observation 90 was wrongly taken as 23. The corrected new mean is?
Options:
A) 37.3
B) 36.1
C) 36.5
D) 36.9
E) 36.3

Rationale: "correct sum = ( 36 * 50 + 90 - 23 ) = 1867 . correct mean = 1825 / 50 = 37.3 answer : a"
Answer: A