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2.3 Probability

2.3 Probability

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Question 4

Sienna surveys 80 people about the musical instruments they play. They can choose from piano (PPP), violin (VVV), and guitar (GGG).

4 people play all three instruments. 7 people play piano and violin. 6 people play violin and guitar. 10 people play piano and guitar. 35 people play piano. 20 people play violin. 25 people play guitar.

a.

Draw a Venn diagram for this information.

[3]
b.

One of the people is selected at random. Given they play guitar, find the probability they do not play piano.

[3]
Markscheme

2.3 Probability Questions

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

200 exam-style questions on OCR A Level Maths 2.3 Probability, covering 2.3.1 Mutually exclusive and independent events, 2.3.2 Diagrams to assist probability calculations, 2.3.3 Conditional probability (A-level only), 2.3.4 Conditional probability from first principles (A-level only), and 2.3.5 Modelling with probability. Each one has a worked solution and a mark scheme showing where the marks go.

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