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4.1 Probability (A-level only)

4.1 Probability (A-level only)

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Question 83

A factory uses three machines. Machine A A\,A makes 40% of the components, machine B B\,B makes 35% and machine C C\,C makes the rest. The probabilities that a component is defective are 0.02, 0.03 and 0.05 for machines AAA, B B\,B and C C\,C respectively.

a.

Find the probability that a randomly selected component is defective.

[3]
b.

Given that a component is defective, find the probability that it was made by machine CCC.

[3]
Markscheme

4.1 Probability (A-level only) Questions

  1. A Level
  2. /Maths
  3. /4.1 Probability (A-level only)

164 exam-style questions on WJEC A Level Maths 4.1 Probability (A-level only), covering 4.1.1 Probability (A-level only), 4.1.2 Probability (A-level only), and 4.1.3 Probability (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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