Histograms and Frequency Density (Edexcel GCSE Maths): Flashcards
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Practise the cards
12 cards from this deck
Type of chart with bars of different widths
Type of chart with bars of different widths
Histogram
What histogram vertical axis shows
What histogram vertical axis shows
Frequency density
Formula for frequency density
Formula for frequency density
rac{ ext{Frequency}}{ ext{Class Width}}
Formula to find frequency from histogram
Formula to find frequency from histogram
What area of histogram bar represents
What area of histogram bar represents
Frequency for that class interval
Key difference: histograms vs regular bar charts
Key difference: histograms vs regular bar charts
Histograms have different bar widths; bar charts have equal widths
Best data type for histograms
Best data type for histograms
Grouped data with unequal class intervals
Does tallest bar always have most data?
Does tallest bar always have most data?
No, must consider both height and width
How to find actual frequency from histogram
How to find actual frequency from histogram
Multiply frequency density by class width
What frequency density accounts for
What frequency density accounts for
Both frequency and class width
First step creating histogram from table
First step creating histogram from table
Calculate class width for each interval
Why use frequency density not just frequency?
Why use frequency density not just frequency?
Allows fair comparison across different interval widths