The table shows the monthly utility expenses of a household over a year. Monthly Utility Expenses in Household Z (in USD) Month Expenses (USD) January $220 February $210 March $205 April $200 May $190 June $185 July $180 August $182 September $190 October $195 November $200 December $215 Which type of graph would best represent the monthly utility expenses of Household Z over a year, and why?
Answer
A
Line graph, because it can show trends over time.
B
Scatter plot, because it shows the relationship between two variables.
C
Pie chart, because it shows parts of a whole.
D
Histogram, because it shows the frequency of expenses.
Explanation
The data lists utility expenses in order by month, so the goal is to see how the amount changes over time. A line graph connects each month’s expense and makes the overall trend—such as the decrease through July and rise toward December—easy to see. Therefore, the best choice is a line graph because it can show trends over time.
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