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Probability

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Question 7

A company has three machines that produce a component. Machine D produces 50% of the components. Machine E produces 30% of the components and machine F produces 20% of the components.

If a component is produced by machine D the chance that it will be faulty is 4%. If a component is produced by machine E the chance that it will be faulty is 3%. If a component is produced by machine F the chance that it will be faulty is 2%.

a.

Draw a tree diagram to show this information.

[3]
b.

A component is selected at random. Find the probability it is from machine D and faulty.

[2]
c.

A component is selected at random. Find the probability it is faulty.

[2]
Markscheme

Probability Questions

  1. A Level
  2. /Maths
  3. /Probability

186 exam-style questions on Edexcel A Level Maths Probability, covering 5.1 Calculating Probabilities, 5.2 Venn Diagrams, 5.3 Mutually Exclusive and Independent Events, and 5.4 Tree Diagrams. Each one has a worked solution and a mark scheme showing where the marks go.

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