Incorrect. The mean is the sum of all the numbers divided by 31 (the number of numbers in the data set). The values in order from least to greatest are:

4, 4, 4, 4, 5, 5, 6, 7, 7, 8, 8, 9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 11, 12, 12, 13, 13, 13, 13, 14

The median is the number in the middle of the list. The mode is the single number that appears most often. The range is found by subtracting the least value from the greatest value in the set. The midrange is found by adding the least and greatest values in the set and dividing by 2.