Here's a quick guide (so you don't have to do the math):
3-4 people: 4 pounds (2 bones)
4–5 people: 5 pounds (2-3 bones)
5–6 people: 6 pounds (3 bones)
6–7 people: 7 pounds (3-4 bones)
8–10 people: 10 pounds (5 bones)
10–12 people: 14 pounds (7 bones)
