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Calculate arithmetic means · Check your progress
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Find medians · Check your progress
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Find every mode · Check your progress
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Calculate ranges · Check your progress
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Count single-event probabilities · Check your progress
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Find quartiles and interquartile range · Check your progress
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Estimate grouped percentiles · Check your progress
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Read bar charts · Check your progress
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Read line graphs · Check your progress
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Read pie charts · Check your progress
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Read dot diagrams, histograms and pictograms · Check your progress
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Calculate arithmetic means · Check again
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Find medians · Check again
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Find every mode · Check again
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Calculate ranges · Check again
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Count single-event probabilities · Check again
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Find quartiles and interquartile range · Check again
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Estimate grouped percentiles · Check again
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Read bar charts · Check again
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Read line graphs · Check again
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Read pie charts · Check again
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Read dot diagrams, histograms and pictograms · Check again
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Calculate arithmetic means · Retention check
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Find medians · Retention check
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Find every mode · Retention check
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Calculate ranges · Retention check
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Count single-event probabilities · Retention check
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Find quartiles and interquartile range · Retention check
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Estimate grouped percentiles · Retention check
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Read bar charts · Retention check
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Read line graphs · Retention check
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Read pie charts · Retention check
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Read dot diagrams, histograms and pictograms · Retention check
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Practise: Calculate arithmetic means
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Practise: Find medians
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Practise: Find every mode
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Practise: Calculate ranges
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Practise: Count single-event probabilities
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Practise: Find quartiles and interquartile range
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Practise: Estimate grouped percentiles
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Practise: Read bar charts
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Practise: Read line graphs
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Practise: Read pie charts
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Practise: Read dot diagrams, histograms and pictograms
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Revision notes
Organise data in tables, histograms and dot diagrams, interpret averages and cumulative frequency, and calculate single-event probabilities.
Key ideas
- Collect data and make a table
Organise observations into a frequency table, choose a suitable display and check what the data can support.
- Histograms and dot diagrams
Use numerical intervals for a histogram and one mark per observation for a dot diagram.
- Mean, median and mode
Choose a measure for the question and sort the values before finding positional summaries.
- Recover the data before finding a summary
Recover individual frequencies from running totals or a removed group, then find a mean, median, mode or range.
- Quartiles, percentiles and cumulative frequency
Read cumulative counts at class boundaries and treat grouped-data interpolation as an estimate.
- Single-event probability
List the sample space and justify equal likelihood before counting favourable outcomes.
From the G1 Mathematics 2027 syllabus
- Simple concepts in collecting, classifying and tabulating data
- Analysis and interpretation of: ∗ tables ∗ bar graphs ∗ pictograms ∗ line graphs ∗ pie charts ∗ dot diagrams ∗ histograms with equal class intervals ∗ cumulative frequency diagrams
- Purposes and use, advantages and disadvantages of the different forms of statistical representations
- Purposes and use of mean, mode and median
- Calculation of the mean, mode and median for a set of ungrouped data
- Percentiles, quartiles, range and interquartile range
- Probability as a measure of chance
- Probability of single events (including listing all the possible outcomes in a simple chance situation to calculate the probability)