A rancher’s herd of 250 sheep grazes over a 40-acre pasture. He would like to find out how many sheep are grazing on each acre of the pasture at any given time, so he has some images of the pasture taken by the state department of agriculture’s aerial photography division. Here are three samples of the images.

Sample 1        4
Sample 2        1
Sample 3        9

What can the rancher conclude from these samples about how many sheep graze on each acre of the 40-acre pasture?