UFO's, n(a)=29
A
42=n(a)+n(b)+n(c)+n(d)
42=n(a)+2+2+9
42=n(a)+13
n(a)=42-13
n(a)=29
Bigfoot, n(e)=13
E
21=n(b)+n(c)+n(e)+n(f)
21=2+2+n(e)+4
21=n(e)+8
n(e)=21-8
n(e)=13
Ghosts, n(g)=30
G
45=n(c)+n(d)+(n)f+n(g)
45=2+9+4+n(g)
45=15+n(g)
n(g)=45-15
n(g)=30
B
4=n(b)+n(c)
4=n(b)+2
n(b)=4-2
n(b)=2
D
11=n(c)+n(d)
11=2+n(d)
n(d)=11-2
n(d)=9
F
6=n(c)+n(f)
6=2+n(f)
n(f)=6-4
n(f)=4
C
n(c)=2
Discussion Question 1 - Sets
160 Total People Surveyed
Number of people who beilieve in at least one thing, or n(h)
n(h) =
n(a)+n(b)+n(c)+n(g)+n(e)+n(f)+n(g)
n(h)=29+2+2+9+13+4+30
n(h)=89
Number of peple who believe in none of these things, or n(i)
n(i)=160-n(h)
n(i)=160-89
n(i)=71
