Unit 3 Graphs, tables and charts 3 Extend 2 3 The pictogram shows the numbers of text messages Katherine sent. Write an expression in terms of m for the number of text messages Katherine sent on a Monday b Tuesday c Wednesday. Problem-solving Students in Year 11 were asked whether they walk or cycle, or walk and cycle to school. The bar chart shows some of the results. All 203 Year 11 students took part in the survey. How many both walk and cycle to school? Monday Tuesday Wednesday represents m messages Key Number of students 1 Travel to school 200 137 100 52 0 Walk Cycle Walk and cycle Method of transport Reasoning The diagram gives information about the height of some buildings. 198 150 Q3 hint What do you notice about the scale on the vertical axis? What about the shape of the bars? 40 Howard Tower Jones Centre Thornton Bank Write two things that could be wrong or misleading in the diagram. Real / Communication The graph shows the cost of the gas Charlie has used over the last 12 months. Charlie wants to make monthly payments for his gas. He thinks his gas is going to cost the same for the next 12 months. Charlie works out he should pay exactly £40 per month to cover the cost over 12 months. Is he correct? Explain your answer. Q4 communication hint Quarterly means every quarter (three months) of the year. 250 Quarterly gas cost 200 Cost of gas (£) 4 150 100 50 0 0 Jun-Aug Sep-Nov Dec-Feb Mar-May Quarter 85