Problem: the mean of 50 observations was 36 . it was found later that an observation 58 was wrongly taken as 43 . the corrected new mean is ?
Rationale: "correct sum = ( 36 * 50 + 58 - 43 ) = 1815 . correct mean = 1815 / 50 = 36.3 answer : e"
annotated_formula: divide(add(multiply(36, 50), subtract(subtract(50, const_2), 43)), 50)