1. L.O. Use venn diagrams to find probability
There are 50 people in a year group.
10 study Geography only.
20 study History only.
In addition, 5 study both history and geography.
History 50
Geography
20 ppl
5 ppl
10 ppl
The “universal” set of all people/all possible events.

2. L.O. Use venn diagrams to find probability
n(G ∩ H´) =
n(G´ ∩ H) =
n(H u G´) =
n(H´ ∩ G´)=
n(H) =
n(G´) =
n(H ∩ G) =
n(G υ H) =
History 20
Geography 10 5 50
History 20
Geography 10 5 50
History 20
Geography 10 5 50
History 20
Geography 10 5 50
History 20
Geography 10 5 50
History 20
Geography 10 5 50
History 20
Geography 10 5 50
History 20
Geography 10 5 50
History 20
Geography 10 5 50
History 20
Geography 10 5 50
History 20
Geography 10 5 50
History 20
Geography 10 5 50
History 20
Geography 10 5 50
History 20
Geography 10 5 50
History 20
Geography 10 5 50
History 20
Geography 10 5 50

3. L.O. Use venn diagrams to find probability
Normally we will deal with probability instead.
P(A)=
P(B)=
P(A´)=
P(B´)= A B
0.6
0.1
0.2 є
P(A ∩ B) =
P(A u B) =
P(A u B´)=
P(A ∩ B´)=

4. L.O. Use venn diagrams to find probability
Mutually exclusive: if one happens, the other cannot.
Mutually exhaustive: these events cover all possibilities. є
0 items
0 items є є