Edexcel IGCSE Math A Higher 6.3 Ha Tree Diagrams Questions

Practise tree-diagram questions by filling branch probabilities, following paths and combining probabilities for required outcomes.

Exam points

Complete missing branch probabilities on a probability tree diagram accurately.
Multiply along branches to find the probability of a two-stage outcome.
Add relevant path probabilities when more than one route gives the required event.

[Maximum number: 2]

Emilie takes part in two races.
The probability that she wins the first race is 0.7
The probability that she wins the second race is 0.4
The outcomes of the two races are independent.

Complete the probability tree diagram.

First race

Second race

Figure for Question Edexcel IGCSE Math A Higher 6.3 Ha Tree Diagrams Questions question 1 — Edexcel IGCSE Math A Higher

First race missing probability:
0.3
Second race branch probabilities:
$0.6,\quad 0.4,\quad 0.6$
B1 for the first race branch, B1 for the second race branches.

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Edexcel IGCSE Math A Higher 6.3 Ha Tree Diagrams Questions question 1