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Probability

Probability

Medium
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Question 2

In a factory, machines AAA, B B\,B and C C\,C are all producing metal rods of the same length. Machine A A\,A produces 35% of the rods, machine B B\,B produces 25% and the rest are produced by machine CCC. Of their production of rods, machines AAA, B B\,B and C C\,C produce 3%, 6% and 5% defective rods respectively.

a.

Draw a tree diagram to represent this information.

[3]
b.

Find the probability that a randomly selected rod is

(i) produced by machine A A\,A and is defective,

(ii) is defective.

[3]
c.

Given that a randomly selected rod is defective, find the probability that it was produced by machine CCC.

[3]
Markscheme

Probability Questions

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

11 exam-style questions on Edexcel A Level Old Maths Probability. Each one has a worked solution and a mark scheme showing where the marks go.

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