The mean of 50 observations was 36. It was found later that an observation 48 was wrongly taken as 23. The corrected new mean is?  Pick one:
A) 36.6 B) 36.1 C) 36.5 D) 36.2 E) 36.9

Rationale: "correct sum = ( 36 * 50 + 48 - 23 ) = 1825 . correct mean = 1825 / 50 = 36.5 answer : c"
Answer: C