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Tree DiagramsCalculate the probability of independent and dependent combined events using tree diagrams. |
1. In a box there are five red balls and four yellow balls. On Monday John picked a ball at random from the box, played with it then put it back. On Tuesday he picked a ball at random from the box.
a) Complete the tree diagram.
b) What is the probability that on both days he picked a red ball? /
c) What is the probability that on both days he picked a yellow ball? /
d) Calculate the probability that on Monday he picked a red ball and on Tuesday he picked a yellow ball./
Red
Yellow
Red
Yellow
Red
Yellow
2. In a round tin there are six cream cakes and five plain cakes. In a square based tin there are three cream cakes and six plain cakes. The tree diagram shows the probabilities of picking one cake from each tin.
a) Complete the tree diagram.
b) What is the probability of picking two cream cakes? /
c) What is the probability of picking two plain cakes? /
d) Calculate the probability of picking two different types of cake./
Cream
Plain
Cream
Plain
Cream
Plain
3. In a packet there are seven lemon sweets and four lime sweets. This morning John ate one sweet from the packet before breakfast and he ate another after breakfast. Both sweets were picked randomly from what was in the packet at the time.
a) Complete the tree diagram.
b) What is the probability of picking two lemon sweets? /
c) What is the probability of picking a lemon sweet followed by a lime sweet? /
d) Calculate the probability of picking a lime sweet followed by a lemon sweet?./
Lemon
Lime
Lemon
Lime
Lemon
Lime
4. The probability that the first bus is late is \( \frac{1}{18}\). If the first bus is late, the probability of the second bus being late is \( \frac{1}{17}\) otherwise it is \( \frac{1}{16}\) (buses are either on time or late, they are never early!).
a) Complete the tree diagram.
b) What is the probability of both buses being late? /
c) What is the probability of both buses being on time? /
d) What is the probability of at least one bus being on time? /
Late
On Time
Late
On Time
Late
On Time
5. In a bag there are seven red, eight blue and nine green counters. Two counters are taken out and not replaced.
a) Complete the tree diagram.
b) What is the probability of both counters being red? /
c) What is the probability of both counters not being red? /
d) What is the probability of at least one counter being red? /
Red
Not red
Red
Not red
Red
Not red
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Mathematicians are not the people who find Maths easy; they are the people who enjoy how mystifying, puzzling and hard it is. Are you a mathematician? Comment recorded on the 19 June 'Starter of the Day' page by Nikki Jordan, Braunton School, Devon: "Excellent. Thank you very much for a fabulous set of starters. I use the 'weekenders' if the daily ones are not quite what I want. Brilliant and much appreciated." Comment recorded on the 6 May 'Starter of the Day' page by Natalie, London: "I am thankful for providing such wonderful starters. They are of immence help and the students enjoy them very much. These starters have saved my time and have made my lessons enjoyable." |
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Level 1 - Basic probability questions for which the tree diagram has already been drawn
Level 2 - More probability questions requiring you to draw your own tree diagrams
Level 3 - A challenging puzzle that can be solved with the aid of a tree diagram
Exam Style Questions - A collection of problems in the style of GCSE or IB/A-level exam paper questions (worked solutions are available for Transum subscribers).
More on this topic including lesson Starters, visual aids, investigations and self-marking exercises.
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