Histograms and Frequency Density (Edexcel GCSE Maths): Quizzes
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Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What makes histograms different from regular bar charts?
What makes histograms different from regular bar charts?
Histograms can have bars of different widths
What does the vertical axis of a histogram show?
What does the vertical axis of a histogram show?
Frequency density
What is the formula for frequency density?
What is the formula for frequency density?
How do you find frequency from a histogram?
How do you find frequency from a histogram?
Frequency Density Class Width
A class has frequency 30 and width 5. What is the frequency density?
A class has frequency 30 and width 5. What is the frequency density?
6
A bar has frequency density 8 and class width 3. What is the frequency?
A bar has frequency density 8 and class width 3. What is the frequency?
24
What does the area of each bar in a histogram represent?
What does the area of each bar in a histogram represent?
The frequency for that class interval
Why can't you assume the tallest bar has the most data?
Why can't you assume the tallest bar has the most data?
Class widths may differ
Why use frequency density instead of just frequency?
Why use frequency density instead of just frequency?
To compare data fairly across different widths
What are histograms particularly useful for showing?
What are histograms particularly useful for showing?
Grouped data with unequal class intervals
If a narrow interval has 20 items and a wide one has 20, which has higher frequency density?
If a narrow interval has 20 items and a wide one has 20, which has higher frequency density?
The narrow interval
What must you multiply to get actual frequency from a histogram?
What must you multiply to get actual frequency from a histogram?
Frequency density by class width