The graph shows the savings of Dina in a five-month period. Find the difference between her highest and lowest savings.
The graph shows Dina’s savings in January, February, March, April, and May. The dot that represents January is halfway between eight and 12. The midpoint of eight and 12 is 10. Therefore, Dina saved 10 pound in January. The second dot represents February. In this month, she saved eight pound. In March, Dina saved 16 pound. In April, once again, the amount that Dina saved is halfway between two values. It is halfway between 20 and 24. This is equal to 22 pound. Finally, Dina saved six pound in May, as this is halfway between four and eight. The midpoints of each of the number of pounds shown on the 𝑦-axis are labelled in pink.
Our next step is to find the highest and lowest savings. Dina’s highest saving was in April, as this is the highest point on the graph. This was equal to 22 pound. Her lowest saving was equal to six pound in May. In order to calculate the difference between these two values, we need to subtract six from 22. This is equal to 16. Therefore, the difference between Dina’s highest and lowest savings is 16 pound.