1. The problem involves interpreting a cumulative frequency graph of tree heights to find the median height. 2. The cumulative frequency graph shows the total number of trees up to a certain height. The maximum cumulative frequency is about 60, so the median corresponds to half of this, which is 30. 3. To find the median height, locate the cumulative frequency value of 30 on the y-axis. 4. From the graph description, the cumulative frequency of 30 corresponds to a height slightly above 150 cm. 5. Therefore, the median height of the trees is approximately $\mathbf{150 \text{ cm}}$. This means half of the trees are shorter than about 150 cm, and half are taller.