WJEC A-Level Business 601-5238-2
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Business Analysis and Decision-Making
Presenting and interpreting data: pie charts, histograms and index numbers
- 3 things to know
- A2 Unit 3
Overview
Presenting and reading business data: pie chart angles, histograms and frequency density, and calculating, interpreting and comparing index numbers, with their limitations.
What you need to know
Answer each one before you reveal it.
How does a histogram differ from a bar chart?
How is frequency density calculated for a histogram with unequal class widths?
Questions from this subtopic
Each one with the model answer underneath.
- 1
When is a pie chart a suitable way to present business data?
Model answer
When showing how a total divides into parts, such as market share or the sources of a firm's revenue, with only a few categories.
- 2
How is the angle of a pie chart segment calculated?
Model answer
Multiply the segment's share of the total by 360°, so a product earning 25% of revenue takes 0.25 × 360 = 90°.
- 3
What are the limitations of pie charts?
Model answer
They are hard to read with many small segments, show proportions rather than actual values, and make comparisons over time difficult.
- 4
How does a histogram differ from a bar chart?
Model answer
A histogram shows continuous data grouped into classes, with no gaps between bars, and the area of each bar, not its height, represents the frequency.
- 5
How is frequency density calculated for a histogram with unequal class widths?
Model answer
Frequency density = frequency ÷ class width; for example 40 customers spending £0–£10 gives 4.0 per pound, and 60 spending £10–£30 gives 3.0.
- 6
What is an index number?
Model answer
A figure showing how a value has changed relative to a base period, which is given the value 100.
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