Concept:The mode is the value that appears most frequently in a data set.Explanation:List the observations: 10,19,22,16,15,18,20,18,14,18,23.Count the frequency of each number:10 appears 1 time, 19 appears 1, 22 appears 1, 16 appears 1, 15 appears 1, 18 appears 3 times, 20 appears 1, 14 appears 1, 23 appears 1.The highest frequency is 3, corresponding to 18.Answer:The mode is 18.