There are eight dogs in a kennel. Each of the two small dogs needs 1 cup of dry food per day. Each of the three medium-sized dogs needs 2 cups per day. Each of the remaining three large dogs needs 4 cups per day. What is the mean number of cups of food required per dog each day?
1 + 1 + 2 + 2 + 2 + 4 + 4 + 4 = 20 20