Here is a list of seven numbers. One of the numbers is hidden.
| 8 | 5 | 12 | 9 | 6 | 11 | ? |
The mean of the numbers is 10.
Find the value of the hidden number.
201 exam-style questions on Eduqas GCSE Maths Averages. Each one has a worked solution and a mark scheme showing where the marks go.