In a bag of marbles there are
8 red marbles 12 blue marbles 5 green marbles
Sarah takes one of the marbles at random.
Write down the probability that Sarah takes a blue marble.
Practise Edexcel GCSE Maths Probability with exam-style questions for Foundation and Higher tier. 100 questions, matched to the Edexcel GCSE Maths (1MA1) specification and written in Paper 1, Paper 2 and Paper 3 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.