This key facts covers Key Facts About Bar Charts within Bar Charts & Pictograms for GCSE Mathematics. Revise Bar Charts & Pictograms in Statistics for GCSE Mathematics with 11 exam-style questions and 20 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 2 of 11 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Key Facts About Bar Charts
- Purpose: Compare different categories or groups
- Axes: Categories on horizontal axis, frequencies on vertical axis
- Bar width: All bars should be equal width
- Bar spacing: Equal gaps between bars
- Scale: Must start at zero and be evenly spaced
- Labels: Clear titles and axis labels are essential
- Data type: Used for discrete (categorical) data
Practice questions for Bar Charts & Pictograms
In a pictogram, the key shows that one symbol represents 4 people. A row shows 3 and a half symbols. How many people does this row represent?
A bar chart comparing two companies' sales has a vertical axis starting at 900 rather than 0. Company A has sales of 950 and Company B has sales of 1000. Explain why this bar chart could be misleading.