The table shows information about the heights of a sample of 100 trees in a forest. Complete the table below to show the cumulative frequencies for the data.

Cumulative frequency is a "running total". 1. The first cumulative frequency is the same as the first frequency (8). 2. For the second row (h ≤ 10), add the frequency of that group (23) to the previous cumulative frequency (8). So, 8 + 23 = 31. 3. For the third row (h ≤ 15), add the frequency of that group (40) to the new cumulative frequency (31). So, 31 + 40 = 71. 4. Continue this process until you reach the last row. The final cumulative frequency should equal the total number of trees (100).