18-19 5 16-17 9 14-15 5 12-13 3 10-11 1 8-9 2 How many students are in the sample? 15 20 22 25
The total number of students in the sample can be calculated by adding up the frequency for each age range:
5 + 9 + 5 + 3 + 1 + 2 = 25
Therefore, there are 25 students in the sample.