the average height of 30 students in a class was calculated as 175 cm . it has later found that the height of one of the students in the class was incorrectly written as 151 cm whereas the actual height was 136 cm . what was the actual average height of the students in the class ?
"the total height was 15 cm too much . the average height should be reduced by 15 cm / 30 = 0.5 cm the answer is a ."
divide(subtract(multiply(30, 175), subtract(151, 136)), 30)