the average of 20 numbers is calculated as 30 . it is discovered later on that while calculating the average , one number namely 36 was wrongly read as 26 . the correct average is ?
"20 * 30 + 36 – 26 = 160 / 10 = 60 answer : 60 answer is c"
add(30, divide(subtract(36, 26), 20))