Histograms & frequency density
AQA GCSE Maths revision on Histograms & frequency density. Aligned to the AQA GCSE Mathematics 8300 specification. This bank has 16 practice questions on this topic.
Sample questions (3 of 16)
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Question 1
What does the area of a bar in a histogram represent?
- A) The frequency of data
- B) The class width value
- C) The density of groups
- D) The median of values
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Answer: The frequency of data
The area of each bar is equal to the frequency. Students often confuse this with the height, which represents the frequency density.
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Question 2
A histogram bar has a width of 5 and a frequency density of 4. What is the frequency of this group?
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Answer: 20
Multiplying the width (5) by the frequency density (4) gives a frequency of 20. A common error is to divide the numbers instead of multiplying them.
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Question 3
Which axis is always used to plot frequency density in a standard histogram?
- A) The vertical axis
- B) The horizontal axis
- C) The diagonal axis
- D) The secondary axis
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Answer: The vertical axis
Frequency density is plotted on the vertical axis (y-axis). The horizontal axis (x-axis) is reserved for the continuous variable being measured.
Want to test yourself on the remaining cards for this topic?
13 more questions on Histograms & frequency density — plus mistakes tracking and spaced repetition across the whole Maths spec.