Mammoth Hunting Detective Solutions

1) 800 cubic feet

2) About 8 feet

3) 4,800 pounds or 400 pounds for each of 12 hunters

4) Archaeologists don't know, maybe 10-20 hunters

5) Perhaps two weeks in the warm summer months. 
Many months in winter, if the meat was frozen to preserve it.

6) It would depend on many things. Unless hunters could run one
off a cliff or trap one in a steep canyon, few hunters would tackle
a full grown mammoth out in the open unless it was sick or wounded.