IGCSE Maths / Working with data

Reading frequencies from a histogram revision notes

Edexcel International GCSE Maths (4MA1), chapter 19: Working with data, specification point 6.1a. Part of the full course.

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A histogram bar’s frequency is its area, found by multiplying frequency density by class width. This lets you read the number of people in each class and compare bars correctly.

More lessons in Working with data

• Bar charts, pie charts and pictograms
• Two-way tables and reading statistical diagrams
• Mean from a frequency table
• Estimated mean and modal class for grouped data
• Frequency density
• Drawing a histogram
• Completing a histogram from a part drawn graph
• Estimating a frequency within a class
• Building a cumulative frequency table
• Plotting a cumulative frequency diagram
• Reading values from a cumulative frequency graph
• Estimating how many are above or below a value
• Estimating the median from a cumulative frequency diagram
• Estimating the interquartile range from a cumulative frequency diagram
• Comparing two cumulative frequency distributions
• Mean, median, mode and range
• Quartiles and the interquartile range for discrete data
• What a measure of spread tells you
• Using the interquartile range to compare distributions