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UFOs

a) 29

Ghosts

e) 30

 

 

Bigfoot

g) 13

b) 9

d) 2

f) 4

c) 2

How many people believe in at least one of these things?

c) 2 people believed in all three.
6 people believed in ghosts and Bigfoot, so 6-2(c)=4(f).
11 believed in UFOs and ghosts, so 11-2(c)=9(b).
4 believed in UFOs and Bigfoot, so 4-2(c)=2(d).
42 believed in UFOs, so 42-9-2-2=29(2).
21 believed in Bigfoot, so 21-4-2-2=13(g)
45 believed in ghosts, so 45-9-4-2=30(e)
All regions added up = 89
160(people surveyed)-89 (people who believed in at least one)=71 (don't believe)