A report presents the CO emissions of 300 cars. The five classes used have different widths, but the report draws five bars of equal width whose heights are the class frequencies. Two cars are marked on the diagram as separate crosses, well to the right of all five bars.
Explain why the report's diagram is misleading.
State the change needed to make the diagram a correct histogram.
State what the two crosses represent, and interpret them in context.
244 exam-style questions on AQA A Level Maths 2.2 L: Data presentation and interpretation, covering 2.2.1 Single-variable data diagrams, 2.2.2 Scatter diagrams and correlation, 2.2.3 Central tendency, variation and standard deviation, 2.2.4 Outliers and cleaning data, and 2.2 L: Data presentation and interpretation. Each one has a worked solution and a mark scheme showing where the marks go.