the mean of 50 observations was 40 . it was found later that an observation 45 was wrongly taken as 15 the corrected new mean is
"explanation : correct sum = ( 40 * 50 + 45 - 15 ) = 2030 correct mean = = 2030 / 50 = 40.6 answer : e"
divide(add(multiply(40, 50), subtract(subtract(50, const_2), 15)), 50)