Linda made a frequency distribution, setting up groups for the data shown her first group was for 5-9
what was the frequency of her third group?
17 ,35,21,14,15,26,29,8,27,9,18,19,11, 19,16,31,14,10

The first group is 5 - 9, the second group is 10 - 14 and the third group is 15 - 19. We now find the number of data within the interval 15 - 19. In the given frequency distribution, 17, 15, 18, 19, 19 and 16 are within the interval 15 - 19. Therefore, the frequency of the third group is 6.