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Edexcel IGCSE Math B 10.I conditional probability

Practise conditional-probability questions by updating totals after each stage, completing the tree and multiplying or adding paths.

Syllabus
First assessment 2018
Course
Math B 4MB1

Exam points

  • Complete tree diagrams with changed totals after counters or items move between bags.
  • Multiply along branches and add relevant paths for same-colour or required outcomes.
  • Use conditional information to update probabilities before the next selection.

10.I Conditional probability question 1

[Maximum number: 3]

Table 1 gives information about the probability that a biased red six-sided dice will land on each of the numbers 1,2,5,7,9,11.

Table for Question 10.I Conditional probability question 1 — Edexcel IGCSE Math B

A biased blue six-sided dice has faces numbered 2, 4, 6, 8, 10, 12.
The probability that the blue dice lands on the number 2 is 0.24.
The probability that the blue dice lands on the number 4 is 0.12.
In a game Tai rolls the red dice once and the blue dice once.
The number that the red dice lands on is added to the number that the blue dice lands on to give his score in the game.
Given that his score is less than 6, find the probability that the red dice lands on the number 2.

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