What is the mode of the following data set: 3, 5, 7, 5, 8, 5, 9?
Correct: B
The mode is the value that appears most frequently in a data set. In the given data set (3, 5, 7, 5, 8, 5, 9), the number 5 appears three times, which is more often than any other number. Therefore, the mode is 5.