1. How to find probabilities of 2 events using a tree diagram
10 October, 2004
Probability Tree Diagrams
How to find probabilities of 2 events using a tree diagram

2. A coin and a single dice are thrown at the same time
A coin and a single dice are thrown at the same time. What is the probability of getting a 4 on the dice and head on the coin?
First: workout the two separate probabilities
.The Dice
P(4) = 1/6
P(not 4) =5/6
The Coin
P(Head) = 1/2
P(not head) = 1/2

3. A coin and a single dice are thrown at the same time
A coin and a single dice are thrown at the same time. What is the probability of getting a 4 on the dice and head on the coin?
Second: Draw a diagram like this putting on the results
Head
1/2
.The Dice
P(4) = 1/6
P(not 4) =5/6
The Coin
P(Head) = 1/2
P(not head) = 1/2 4
1/6
1/2
Not Head
Head
1/2
5/6
Not 4
1/2
Not Head

4. A coin and a single dice are thrown at the same time
A coin and a single dice are thrown at the same time. What is the probability of getting a 4 on the dice and head on the coin?
Second: Draw a diagram like this putting on the results
Head
0.5
.The Dice
P(4) = 1/6 = 0.17
P(not 4) =5/6 = 0.83
The Coin
P(Head) = ½ = 0.5
P(not head) = ½ = 0.5 4
0,17
0.5
Not Head
Head
0.5
0.83
Not 4
0.5
Not Head