Final answer:
Rib 11 is an example of a false rib that is also a floating rib because it does not attach to the sternum or another rib's cartilage; instead, it ends within the lateral abdominal wall musculature.
Step-by-step explanation:
An example of a false rib that is also a floating rib is rib 11. To clarify, ribs 1-7 are classified as true ribs, which attach directly to the sternum via their costal cartilage. Ribs 8-10 are false ribs that attach indirectly to the sternum via the cartilage of the next higher rib. The floating ribs, which are ribs 11 and 12, are also considered false ribs, but they do not attach to the sternum at all. Instead, their costal cartilages terminate within the musculature of the lateral abdominal wall, making them 'floating'.