Two local libraries, the North Library and the South Library, organized a joint reading event.
10% of the attendees were staff members, the rest were visitors. 52% of the attendees were from the North Library. 43% of the attendees were visitors from the South Library.
One of the attendees is selected at random. Find the probability that they are a staff member from the North Library.
38 exam-style questions on Edexcel GCSE Maths Two Way Tables. Each one has a worked solution and a mark scheme showing where the marks go.