>https://www.yahoo.com/food/skip-the-corned-beef-and-cook-up-an-authentic-st-79559217621.html

snip
...I bet at least 80 percent of households are going to have leg of lamb, Armstrong predicted...
snap

A leg per houshold? Computes perfectly. 4 legs per lamb. Let me think, 4 housholds for 1 lamb. 80% means 4 out of 5 So the other fith (or 20% of housholds) get the non leg parts of the animal.

I prefer chops :)