UFO
29
Bigfoot
13
Ghosts
30
2
9
4
2
Survey UFOs, ghosts and Bigfoot
42 believed in UFOs 45 believed in ghosts
21 believed in Bigfoot 11 believed in UFOs and ghosts
6 believed in ghosts and Bigfoot
4 believed in UFOs and Bigfoot
2 believed in all three
A= 29 +13+30 = 72