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2.3 Probability

2.3 Probability

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Question 18

The table below shows the membership type of each of 200 customers and whether the customer uses a mobile app.

Uses the appDoes not use the appTotal
Basic681280
Premium4278120
Total11090200

One customer is selected at random. The event B B\,B is that the customer has basic membership, and the event U U\,U is that the customer uses the app.

a.

Find P(B∩U)P(B \cap U)P(B∩U).

[1]
b.

Find P(B∪U)P(B \cup U)P(B∪U).

[1]
c.

Find P(B′∩U′)P(B' \cap U')P(B′∩U′).

[1]
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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