The mean of 20 observations was 36. It was found later that an observation 25 was wrongly taken as 40. The corrected new mean is	Choose the correct answer
A) 30	B) 25.4	C) 40	D) 35.25	E) 26.55

Rationale: "explanation : correct sum = ( 36 * 20 + 25 - 40 ) = 705 correct mean = = 705 / 20 = 35.25 answer : d"
Answer: D