UFO'S
29
BIGFOOT
13
GHOST'S
30
2
9
4
2
Venn-Diagram
starting with the intersection of all athree circles, we work our way out.since 11 people belive in ufo's and ghost's, and 2 belive in all three that leaves 9 that belive in ufo's and ghost's. By calculating and filling all the other space. Then we add up all the regions and our total is 89 people in the union of all three set. If we subtract 160 - 89 =71 did not belive in none. The answer would be 2 people belive in at least one.