The mean of 50 observations was 36. it was found later an observation 48 was wrongly taken as 23 . the corrected new means is :
Answers.
A) 35.2	B) 36.1	C) 36.5	D) 39.1	E) none of these

Rationale: "solution correct sum = ( 36 × 50 + 48 - 23 ) = 1525 . ∴ correct mean = 1825 / 50 = 36.5 answer c"
Answer: C