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2.3 Probability

2.3 Probability

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Question 141

Each student chooses exactly one of art, drama and music. The probabilities are ppp, p+0.15p+0.15p+0.15 and 2p 2p\,2p respectively.

a.

Find ppp.

[2]
b.

For 480 students, find the expected number choosing each subject.

[3]
c.

Two students are selected independently. Find the probability that both choose music.

[1]
Markscheme

2.3 Probability Questions

  1. A Level
  2. /Maths
  3. /2.3 Probability

200 exam-style questions on OCR (MEI) A Level Maths 2.3 Probability, covering 2.3.1 Calculate the probability of an event, 2.3.2 Complementary events, 2.3.3 Expected frequency of an event, 2.3.4 Diagrams to calculate probabilities, 2.3.5 Mutually exclusive and independent events, 2.3.6 Add probabilities for mutually exclusive events, 2.3.7 Multiply probabilities for independent events, 2.3.8 Mutually exclusive and independent events (notation) (A-level only), 2.3.9 Venn diagrams for probabilities (A-level only), 2.3.10 Conditional probabilities (A-level only), and 2.3.11 Independence via conditional probability (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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