IGCSE Maths / Working with data

Estimating a frequency within a class 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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Estimate a frequency for an interval that cuts through histogram classes by using only the part of each bar inside the interval. Add the estimated frequencies and state that the answer is an estimate, because the data within each class is assumed to be spread evenly.

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
• Reading frequencies from a histogram
• Completing a histogram from a part drawn graph
• 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