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Conditional Probability

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Question 35

In a large group of employees, the probability that an employee has a company phone (PPP) is 0.45, the probability that they have a company laptop (LLL) is 0.60, and the probability they have both is 0.30.

a.

Find the probability that a randomly chosen employee has a company phone or a company laptop, P(P∪L)P(P \cup L)P(P∪L).

[2]
b.

Given that a randomly chosen employee has a company laptop, find the probability they also have a company phone, P(P∣L)P(P|L)P(P∣L).

[3]
c.

Find the probability that a randomly chosen employee does not have a company phone, given that they do not have a company laptop, P(P′∣L′)P(P'|L')P(P′∣L′).

[3]

Conditional Probability Questions

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

Practise Edexcel A Level Maths Conditional Probability with exam-style questions for A Level Maths. 152 questions, matched to the Edexcel A Level Maths (9MA0) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

Question bank