what is the average ( arithmetic mean ) of the numbers 21 , 22 , 23 , 23 , 24 , and 25 ?
"{ 21 , 22 , 23 , 23 , 24 , 25 } = { 23 - 2,23 - 1 , 23 , 23,23 + 1,23 + 2 } - - > the average = 23 . answer : e ."
divide(divide(multiply(add(21, 23), add(divide(subtract(23, 21), 21), const_1)), const_2), add(divide(subtract(23, 21), 21), const_1))