In 1960 the life expectancy in the UK was 71 years In 1975 the life expectancy in the UK was 73 years Given that x x\,x years is the life expectancy n n\,n years after 1960.
Using a linear model, form an equation linking x x\,x with nnn.
In 2020 the life expectancy in the UK was 81.8 years. Comment on the suitability of your model in light of this information
Hence calculate the percentage error in the model's prediction for 2020. Give your answer to 3 significant figures.
260 exam-style questions on Edexcel A Level Maths Straight Line Graphs, covering 5.1 y = mx + c, 5.2 Equations of Straight Lines, 5.3 Parallel and Perpendicular Lines, 5.4 Length and Area, and 5.5 Modelling with Straight Lines. Each one has a worked solution and a mark scheme showing where the marks go.