1. Tree Diagrams – Unconditional – Foundation – GCSE Questions
These questions are the same format as previous GCSE exams.
COPY means they use the exact same numbers as the original GCSE question.
Otherwise, they are clone questions using different numbers.
The worksheets are provided in a variety of sizes.

2. Printing To print handouts from slides -
Select the slide from the left. Then click:
File > Print > ‘Print Current Slide’
To print multiple slides -
Click on a section title to highlight all those slides,
or press ‘Ctrl’ at the same time as selecting slides to
highlight more than one. Then click:
File > Print > ‘Print Selection’
To print double-sided handouts -
Highlight both slides before using ‘Print Selection’.
Choose ‘Print on Both Sides’ and ‘Flip on Short Edge’.

3. GCSE GCSE Edexcel Foundation: June 2017 Paper 3, Q22
When a biased 6-sided dice is thrown once, the probability that it will land
on 3 is 0.55
The biased dice is thrown twice.
Lucy draws this probability tree diagram.
The diagram is not correct. 1
When a biased 6-sided dice is thrown once, the probability that it will land
on 3 is 0.55
The biased dice is thrown twice.
Lucy draws this probability tree diagram.
The diagram is not correct.
first throw
second throw
first throw
second throw
0.45
land on 3
0.45
land on 3
0.55
land on 3
0.55
land on 3
0.55
not land on 3
0.55
not land on 3
0.55
land on 3
0.55
land on 3
0.35
not land on 3
0.35
not land on 3
0.45
not land on 3
0.45
not land on 3
Write down two things that are wrong with the probability tree diagram.
Write down two things that are wrong with the probability tree diagram. 1 1 2 2
(Total for Question 1 is 2 marks)
(Total for Question 1 is 2 marks)

5. GCSE Edexcel Foundation: June 2017 Paper 3, Q22
When a biased 6-sided dice is thrown once, the probability that it will land
on 3 is 0.55
The biased dice is thrown twice.
Lucy draws this probability tree diagram.
The diagram is not correct.
first throw
second throw
0.45
land on 3
0.55
land on 3
0.55
not land on 3
0.55
land on 3
0.35
not land on 3
0.45
not land on 3
Write down two things that are wrong with the probability tree diagram. 1 2
(Total for Question 1 is 2 marks)

6. Probabilities should sum to 1
GCSE
Edexcel Foundation: June 2017 Paper 3, Q22 1
When a biased 6-sided dice is thrown once, the probability that it will land
on 3 is 0.55
The biased dice is thrown twice.
Lucy draws this probability tree diagram.
The diagram is not correct.
first throw
second throw
0.45
land on 3
0.55
land on 3
0.55
not land on 3
0.55
land on 3
0.35
not land on 3
0.45
not land on 3
Write down two things that are wrong with the probability tree diagram. 1
Probabilities should sum to 1
0.45 and 0.55 reversed on
first branch of second throw 2
(Total for Question 1 is 2 marks)

7. tom@goteachmaths.co.uk Questions? Comments? Suggestions?
…or have you found a mistake!?
Any feedback would be appreciated .
Please feel free to