A first list of 100 numbers contains 20% ones and 80% threes (in some order). A second list of 100 numbers contains 50% twos and 50% fives (in some order). A third list is obtained by adding the first number from the first list to the first number from the second list to get the first number in the third list, etc., so that the k-th number in the third list is the sum of the k-th numbers in the first two lists. (a) What is the average of the 100 numbers in the third list