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2.3.10 Conditional probabilities (A-level only)

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Question 92

Thirty per cent of customers subscribe to a premium service. Of the premium subscribers, 80% use the mobile app each week. Of the other customers, 20% use the app each week.

a.

Find the probability that a randomly selected customer uses the app in a given week.

[3]
b.

Given that a customer uses the app, find the probability that the customer is a premium subscriber.

[3]
c.

Given that a customer does not use the app, find the probability that the customer is not a premium subscriber.

[3]
Markscheme

2.3.10 Conditional probabilities (A-level only) Questions

  1. A Level
  2. /Maths
  3. /2.3.10 Conditional probabilities (A-level only)

164 exam-style questions on OCR (MEI) A Level Maths 2.3.10 Conditional probabilities (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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