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2.3 Probability

2.3 Probability

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Question 22

A cafe manager records the drink orders of 80 customers. Customers can order Tea (TTT), Coffee (CCC), or Juice (JJJ).

  • 6 customers ordered all three drinks
  • 12 customers ordered both Tea and Coffee
  • 10 customers ordered both Coffee and Juice
  • 15 customers ordered both Tea and Juice
  • 40 customers ordered Tea
  • 35 customers ordered Coffee
  • 25 customers ordered Juice
a.

Draw a Venn diagram for this information.

[3]
b.

One of the customers is selected at random. Given they ordered Coffee, find the probability they did not order Juice.

[3]
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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