Probability Trees

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Hard

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.

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]

Work out the probability that Lily takes two black socks.

[2]

Probability Trees Questions

Practise OCR GCSE Maths Probability Trees with exam-style questions for Foundation and Higher tier. 40 questions, matched to the OCR GCSE Maths (J560) specification and written in the written papers 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.