Complete parts (a) and (b). a. If three students scored 80 on a test and three other students scored 88 on the same test, find the mean, median, and mode for the test scores. b. The mean score on a set of 16 tests is 75. What is the sum of all the test scores? a. The mean of the test scores is (Round to one decimal place as needed.) The median of the test scores is (Round to one decimal place as needed.) Find the mode of the test scores. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. OA. The mode of the test scores is OB. The modes of the test scores are (Use a comma to separate answers as needed.) OC. There is no mode for the test scores. b. The sum of all the test scores is