The mean of 40 observations was 100. It was found later that an observation 50 was wrongly taken as 75 The corrected new mean is	Options:
A) 125.8
B) 102.8
C) 99.375
D) 100.52
E) 122

Rationale: "explanation : correct sum = ( 100 * 40 + 50 - 75 ) = 3975 . correct mean = = 3975 / 40 = 99.375 answer : c"
Answer: C