Researchers monitor two comparable groups with different levels of exposure to ionising radiation for the same length of time. Cancer develops in 28 of the 400 people in the higher-exposure group and in 14 of the 700 people in the lower-exposure group.
What is the cancer risk in the lower-exposure group as a percentage of the cancer risk in the higher-exposure group?
71.4%71.4\%71.4%
5.0%5.0\%5.0%
2.0%2.0\%2.0%
28.6%28.6\%28.6%
102 exam-style questions on Edexcel GCSE Biology 5.4 Non-communicable diseases, covering 5.4.1 Interaction of factors in non-communicable disease, 5.4.2 Lifestyle factors and non-communicable disease, and 5.4.3 Treatments for cardiovascular disease. Each one has a worked solution and a mark scheme showing where the marks go.