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2.3 Probability

2.3 Probability

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Question 46

A drawer contains 8 white socks, 6 black socks, and 6 grey socks. Two socks are pulled from the drawer at random without replacement.

a.

Draw a tree diagram to represent this information.

[3]
b.

Find the probability that the two socks pulled are both grey.

[2]
c.

Given that at least one of the socks pulled is black, find the probability that both socks are black.

[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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