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Probability Trees

Probability Trees

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Question 25

Lily has two drawers of socks, Drawer 1 and Drawer 2.

There are 3 black socks and 4 white socks in Drawer 1.

There are 5 black socks and 1 white sock in Drawer 2.

Lily takes at random a sock from each drawer.

a.

Complete the probability tree diagram.

A probability tree diagram for two drawers, Drawer 1 and Drawer 2. Drawer 1 has two branches: Black and White. Drawer 2 has four branches: Black, White, Black, and White. Each branch has a dotted line for a probability value.

[2]
b.

Work out the probability that Lily takes two black socks.

[2]
Markscheme

Probability Trees Questions

  1. GCSE
  2. /Maths
  3. /Probability Trees

54 exam-style questions on OCR GCSE Maths Probability Trees. Each one has a worked solution and a mark scheme showing where the marks go.

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