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4.1.1 Probability (A-level only)

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Question 49

An industrial plant manufactures photovoltaic cells using three separate production lines: Alpha (AAA), Beta (BBB), and Gamma (GGG). The proportions of the total output produced by each line are 0.45, 0.30, and 0.25 respectively. Data shows that the probability of a cell being defective (DDD) from Line Alpha is 0.02, from Line Beta is 0.04, and from Line Gamma is 0.06.

a.

Construct a tree diagram to represent the production process and the associated defect probabilities.

[3]
b.

Calculate the probability that a randomly selected cell: (i) was produced by Line Gamma and is defective, (ii) is not defective.

[5]
c.

A quality control inspector finds a defective cell. Determine the probability that this cell was not produced by Line Alpha.

[3]
Markscheme

4.1.1 Probability (A-level only) Questions

  1. A Level
  2. /Maths
  3. /4.1.1 Probability (A-level only)

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

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