UFO's
42
Big Foot
21
Ghosts
45
2
9
4
2
How many believed in all 3?
160 People Surveyed
2 People believed in all 3
4 UFO/BF - 2 = 2 (BF/UFO)
6 Ghosts/BF - 2 = 4 (G/BF)
11 UFO/Ghosts - 2 = 9 (UFO/G)
21 Big Foot
45 Ghosts
42 UFO
Add all numbers in venn diagram together
160 - 125 = 35
Answer: 35