Charts and diagrams display data visually. GCSE Maths requires you to read, interpret, and draw various types.
Types of Charts
Bar Charts
Bars represent frequencies. Heights show the count.
- Comparative bar charts: two sets of data side by side.
- Compound bar charts: stacked segments.
Pie Charts
Circle divided into sectors. Each sector angle represents proportion.
Pictograms
Pictures represent data. A key shows what each picture represents.
Frequency Tables
| Score | Frequency |
|---|---|
| 1 | 5 |
| 2 | 8 |
| 3 | 12 |
Grouped Frequency Tables
| Time (min) | Frequency |
|---|---|
| 0-10 | 4 |
| 10-20 | 8 |
| 20-30 | 6 |
Worked Example: Example: Pie Chart
Problem
30 people chose pizza, 20 chose pasta, 10 chose salad. Total = 60.
Pizza: . Pasta: . Salad: .
Solution
Practice Problems
- Draw a pie chart: Red 15, Blue 25, Green 20.
- From a bar chart, find the total frequency.
- A pictogram uses 1 symbol = 4 people. How many symbols for 14 people?
Want to check your answers and get step-by-step solutions?
Key Takeaways
Pie chart angle = (frequency/total) × 360°.
Bar chart: height = frequency.
Always check the scale/key.