Histograms and area keys (Edexcel GCSE Statistics): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What is the formula relating frequency, density, and class width?
What is the formula relating frequency, density, and class width?
Frequency = Density x Width
How do you find the frequency in a histogram using the area key?
How do you find the frequency in a histogram using the area key?
Count squares and multiply
How do you verify your frequency calculations using an area key?
How do you verify your frequency calculations using an area key?
Count squares and multiply by key value
What formula is used to work backwards from frequency to density?
What formula is used to work backwards from frequency to density?
Density = Frequency / Width
What is the main benefit of understanding area keys?
What is the main benefit of understanding area keys?
Interpreting histograms with unequal classes
Calculate frequency: class width 25, density 0.8. What is the frequency?
Calculate frequency: class width 25, density 0.8. What is the frequency?
20
A bar has frequency density 0.5 and class width 20. What is the frequency?
A bar has frequency density 0.5 and class width 20. What is the frequency?
10
Using frequency densities 0.2 for 0–10 and 0.4 for 10–40, total frequency?
Using frequency densities 0.2 for 0–10 and 0.4 for 10–40, total frequency?
14
Histogram bar has frequency density 0.8 and class width 15. Frequency?
Histogram bar has frequency density 0.8 and class width 15. Frequency?
12
Area key: 1 small square = 4 people. A bar shows 9 small squares. Frequency?
Area key: 1 small square = 4 people. A bar shows 9 small squares. Frequency?
36