Problem: the mean of 50 observations was 36 . it was found later that an observation 47 was wrongly taken as 23 . the corrected new mean is
Rationale: "solution correct sum = ( 36 x 50 + 47 - 23 ) = 1824 . â ˆ ´ correct mean = 1824 / 50 = 36.48 . answer d"
annotated_formula: divide(add(multiply(36, 50), subtract(subtract(50, const_2), 23)), 50)