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2.3 Probability

2.3 Probability

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Question 29

A drawer contains 6 black socks, 10 blue socks, and 4 white socks. Two socks are removed 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 removed are both white.

[2]
c.

Given that at least one of the socks removed is blue, find the probability that both socks are blue.

[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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