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Slide 2

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Objective: To calculate probability
Tree Diagrams using a tree diagram.
1st choice
3
R
5 You could either pick
out a red ball...
3
P(red ball) =
5
2
5
B ... or a blue ball.
2
P(blue ball) =
5
Lesley Hall @ Soar Valley College…read more

Slide 3

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Objective: To calculate probability
Tree Diagrams using a tree diagram.
1st choice 2nd choice
R
If you chose a red the 1st
3
R time, you can still choose a
5 red or a blue the 2nd time.
B
2 R
5 If you chose a blue the 1st
B time, you can still choose a
red or a blue the 2nd time.
B
Lesley Hall @ Soar Valley College…read more

Slide 4

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Objective: To calculate probability
Tree Diagrams using a tree diagram.
1st choice 2nd choice
3
5
R
3
R
2 Because we replace the first
5 B ball the probabilities will
5
stay the same!
3
2 5 R
5 + =1
B
2
5 B
Notice that on each pair of
branches the probabilities
add up to 1.
Lesley Hall @ Soar Valley College…read more

Slide 5

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Objective: To calculate probability
Tree Diagrams using a tree diagram.
1st choice 2nd choice
3
5
R
3 R
5 2
5 B
3
2 5 R
5
B
2
5 B
List the outcomes ...
Lesley Hall @ Soar Valley College…read more

Slide 6

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Objective: To calculate probability
Tree Diagrams using a tree diagram.
1st choice 2nd choice
3 3 3 9
5
R RR 5
x
5
=
25
3
R
5 2 3 2 6
5 B RB 5
x
5
=
25
3 2 3 6
2 5 R BR 5
x
5
=
25
5
B
2 2 2 4
5 B BB 5
x
5
=
25
Finally check that your
...and work out the
probabilities add up to 1.
probabilities.
Lesley Hall @ Soar Valley College…read more

Slide 7

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